Malicious PDF — malware analysis report

Static analysis result for SHA-256 141a007f978cdcb8…

MALICIOUS

PDF

85.4 KB Created: 2021-04-06 21:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9739d3e313b76b2e2df590115171d384 SHA-1: 728348728970f8d2209bf1addadcecc2a1268f1f SHA-256: 141a007f978cdcb89c479f5eb62bc86d44e515daa425ec7531fcd3d17ff70ddf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/strik?utm_term=denon+avr+s510bt+bluetooth+pairing+without+remote PDF link annotation
    • https://cdn.sqhk.co/madumubo/PifThig/vomelakimufotezanori.pdfIn PDF document text
    • https://rofewonopanofav.weebly.com/uploads/1/3/5/3/135312507/kawazope_guwevewogaz_liteduwaberogux_jixuzezokomaxoj.pdfIn PDF document text
    • http://voztrans.ru/26904039020hxzeq.pdfIn PDF document text
    • https://cdn.sqhk.co/bagudivibi/zhdJgcD/87215103802.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxozamikoge/jgcig25/free_fake_outgoing_call_app.pdfIn PDF document text
    • http://vehicleinsusa.com/baposivibuvizikuderigumv6el.pdfIn PDF document text
    • http://mebel-albero.ru/how_to_use_bissell_crosswave_pet_pro_on_carpet01n9g.pdfIn PDF document text
    • http://svoytrylend.xyz/jafabozotokfvzsc.pdfIn PDF document text
    • http://crispyset.online/4_pics_1_word_level_2888_answerscasu.pdfIn PDF document text
    • http://bobr.space/functional_skills_maths_level_1_worksheetssdrlh.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/itnL8u8/lynx_spider_eyes.pdfIn PDF document text
    • http://garderob-podolsk.ru/dave_ramsey_budget_sheetfing0.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/RfDhfje/merchant_of_venice_summary_act_2.pdfIn PDF document text
    • https://gidorimafemona.weebly.com/uploads/1/3/4/8/134867851/bafejipefotifulazef.pdfIn PDF document text
    • https://cdn.sqhk.co/naxetimi/dgcihgy/alphabetical_order_reasoning_questions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_86b492ab3cb94e9da2477992f0848454.pdf?index=trueIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_dab3da29d7db471aa1223fc231482c8e.pdf?index=trueIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_7f245aead537448eb033fb12715541c7.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_deefce9f66ee4a74aa7ddb1df75ae77b.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 5844 bytes
SHA-256: 54713a0b1d876269d2a39a6340100180c322d2c162f6b5098327a95dbcc7f8cf
font_01_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 11388 bytes
SHA-256: 1085d436986d30d05a73aca03b581da0e99a4466b523bf01a0488b7b9a37a59b

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