PDF malware analysis — malicious · 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)

MD5: d0861daaacd25fcf7128a0ac50e1aa4b SHA-1: 9ad582a81553ebfbc2bf93eb74790625a2bc0c18 SHA-256: 4944d2da3caae1676b8ae59d06cfbba1d89ddb1ce71bf0c30b6c313eca7d49be

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to host many PDFs. One of the primary external URIs, 'https://nipisod.ru/wix?keyword=reading+explorer+4+answer+key+unit+6', suggests a lure related to educational materials to direct users to a potentially malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 5

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.
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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
- http://vowufijetapiko.sportsontheweb.net/used_murray_riding_mower_for_sale.pdf
- http://midikakuvekume.mywebcommunity.org/books_for_dummies_template.pdf
- http://jologedeb.getenjoyment.net/who_makes_runts_candy.pdf
- http://zotikarida.medianewsonline.com/68762803390.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/juvuraguvutoxif/have_got_test_worksheet.pdf
- https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_bd797dc465bd46d6a881ebcba4d71971.pdf?index=true
- https://s3.amazonaws.com/jotizifime/building_information_management_training_online.pdf
- https://e3cb5659-58e6-429d-903c-960a6f968ccf.filesusr.com/ugd/c4f63d_52c0a86029e540458a2991362b8c831a.pdf?index=true
- https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_8ec09bfa803c414abd83be53e2598530.pdf?index=true
- https://uploads.strikinglycdn.com/files/81537741-f953-416f-bad7-6323f6f36609/28578373412.pdf
- https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_cb3a23c586a74e57ad880401ffd84a89.pdf?index=true
- https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_83098670643a408c8e6cc564059e2d56.pdf?index=true
- https://s3.amazonaws.com/pokorevalaxex/auto_manual_icon.pdf
- https://s3.amazonaws.com/moduluzuxikari/vurevogete.pdf
- https://uploads.strikinglycdn.com/files/bd968567-d696-4874-857a-4c6d27344e80/how_to_read_music_notes_for_beginners_trumpet.pdf
- https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_2055b2b3160e461b8bd01ceacf6dd073.pdf?index=true
- https://uploads.strikinglycdn.com/files/5459e2e8-8ef4-49e9-b982-d5f411f03f29/honeywell_8000_user_manual.pdf
- https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_d2fbf0d630424e1bb693163fabb4127e.pdf?index=true
- https://uploads.strikinglycdn.com/files/c799859c-00a2-4e6e-a711-5f03ec41d680/canon_powershot_sx110_is_power_adapter.pdf
- https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_a0dd5bc0f3b74399baaaef20839ddd08.pdf?index=true
- https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_41c6a31d267a40018da848dccf9d2df6.pdf?index=true
- https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_ba1a772748e14e4ab0cd053596654034.pdf?index=true
- https://uploads.strikinglycdn.com/files/d16d24e1-b4d6-4922-9178-af1702900f35/tigupagobupati.pdf
- https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_6b1256fa2e7546189f049e32fda7b325.pdf?index=true
- https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_af9418a13d3244969dbb59a9ffd97d2f.pdf?index=true
- https://s3.amazonaws.com/duzexefemosaxe/coles_bleach_material_safety_data_sheet.pdf
- http://nedizilunok.myartsonline.com/22137390698.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010960.bin` `331c170e56c5bbbec43d1ed36f6c3ebc243c3ed2e6cb374ce7aedb92c111f955`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10960	5700 bytes
`font_01_sfnt_off00011d0d.bin` `c778f96ba126f9368ab3c3a1ac03fe2345022c0d53fb66ef82f66589cd2ac6be`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D0D	10984 bytes
`font_02_sfnt_off00014293.bin` `da133098c8ec00180ce5fe37c74b807b143adc5860869a2f7b6211e455203b10`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14293	16112 bytes

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