Malicious PDF — malware analysis report

Static analysis result for SHA-256 4727d72ca0cf935a…

MALICIOUS

PDF

82.2 KB Created: 2021-03-10 19:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: aa56f5905aad4dbca538d281f6ad8096 SHA-1: 2882ac071ebdce7b5d30a7c8115bdba0b0f0a389 SHA-256: 4727d72ca0cf935a6893277a06c0eafceffb738205fddcd275f2b504e875b2db
204 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF hosting sites, suggesting a link farm or phishing lure. The presence of a redirector URL and a 'download button' heuristic further indicates a malicious workflow. ClamAV detection and ML classification confirm the malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/strik?utm_term=marketing+management+class+12+pdf PDF link annotation
    • https://siselujasukoju.weebly.com/uploads/1/3/0/9/130969984/a15ea6966.pdfIn PDF document text
    • http://future-techno.ru/hypertension_treatment_guidelines_20184rkb6.pdfIn PDF document text
    • http://ing-cliente.com/time_traveler_2020_hurricanegmjcd.pdfIn PDF document text
    • https://putejavorem.weebly.com/uploads/1/3/6/0/136057301/5261833.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/33249772478.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/40413862662.pdfIn PDF document text
    • http://intereriia.com/how_to_start_with_free_code_campp56ll.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_3686985977ad4795b41a61b2fa4d17ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesijesule/chehra_masoom_tera_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/what_age_is_big_nate_books_for.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/oxford_dictionary_word_of_the_year_2020_hindi.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_b62171e293d94f19bc277f50c2dd8fe2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce4962f-d921-4994-87aa-aa25b6f6b20e/how_do_you_write_an_authors_contribution_statement.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/4084985374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd86fa3-0303-4bec-864e-b80f736fabb9/46784503755.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_1633df08d3574f9093c7b7a8b93621f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widuxade/chateauform_champery_suisse.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_8a034bb335fa485eaa9d5c9ab44a3763.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_ff3720478a2345b0b76661389a32d2b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ccfc24b-5cc7-49fa-8b1a-12e7029283f7/44639586601.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/gamibemefivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0615c1-5e68-4878-95d5-34e715c12e9e/47942298317.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 5408 bytes
SHA-256: 65b18762ae8dc401f4db569973d4f905f7addfaf018ef4498d8ac0bd10ade92b
font_01_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 11056 bytes
SHA-256: e2949573bc39a4ee93f86db5a6638ef95f9b3e81c0d6b1e4e59abd1524460e59
font_02_sfnt_off00012d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378