Malicious PDF — malware analysis report

Static analysis result for SHA-256 4944d2da3caae167…

MALICIOUS

PDF

89.5 KB Created: 2021-03-05 08:19:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d0861daaacd25fcf7128a0ac50e1aa4b SHA-1: 9ad582a81553ebfbc2bf93eb74790625a2bc0c18 SHA-256: 4944d2da3caae1676b8ae59d06cfbba1d89ddb1ce71bf0c30b6c313eca7d49be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to malicious sites. The primary malicious URL identified is 'https://nipisod.ru/wix?keyword=reading+explorer+4+answer+key+unit+6', which is presented as a reading comprehension answer key. This suggests a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/wix?keyword=reading+explorer+4+answer+key+unit+6 PDF link annotation
    • https://s3.amazonaws.com/juvuraguvutoxif/have_got_test_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/building_information_management_training_online.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/used_murray_riding_mower_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/auto_manual_icon.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/vurevogete.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/books_for_dummies_template.pdfIn PDF document text
    • http://jologedeb.getenjoyment.net/who_makes_runts_candy.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/coles_bleach_material_safety_data_sheet.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/68762803390.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_bd797dc465bd46d6a881ebcba4d71971.pdf?index=trueIn PDF document text
    • https://e3cb5659-58e6-429d-903c-960a6f968ccf.filesusr.com/ugd/c4f63d_52c0a86029e540458a2991362b8c831a.pdf?index=trueIn PDF document text
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_8ec09bfa803c414abd83be53e2598530.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81537741-f953-416f-bad7-6323f6f36609/28578373412.pdfIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_cb3a23c586a74e57ad880401ffd84a89.pdf?index=trueIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_83098670643a408c8e6cc564059e2d56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd968567-d696-4874-857a-4c6d27344e80/how_to_read_music_notes_for_beginners_trumpet.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_2055b2b3160e461b8bd01ceacf6dd073.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5459e2e8-8ef4-49e9-b982-d5f411f03f29/honeywell_8000_user_manual.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_d2fbf0d630424e1bb693163fabb4127e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c799859c-00a2-4e6e-a711-5f03ec41d680/canon_powershot_sx110_is_power_adapter.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_a0dd5bc0f3b74399baaaef20839ddd08.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_41c6a31d267a40018da848dccf9d2df6.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_ba1a772748e14e4ab0cd053596654034.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16d24e1-b4d6-4922-9178-af1702900f35/tigupagobupati.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_6b1256fa2e7546189f049e32fda7b325.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_af9418a13d3244969dbb59a9ffd97d2f.pdf?index=trueIn PDF document text
    • http://nedizilunok.myartsonline.com/22137390698.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 5700 bytes
SHA-256: 331c170e56c5bbbec43d1ed36f6c3ebc243c3ed2e6cb374ce7aedb92c111f955
font_01_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 10984 bytes
SHA-256: c778f96ba126f9368ab3c3a1ac03fe2345022c0d53fb66ef82f66589cd2ac6be
font_02_sfnt_off00014293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14293 16112 bytes
SHA-256: da133098c8ec00180ce5fe37c74b807b143adc5860869a2f7b6211e455203b10