Malicious PDF — malware analysis report

Static analysis result for SHA-256 249f3a1a958b2b42…

MALICIOUS

PDF

136.2 KB Created: 2021-04-07 19:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 243217df91f40c9f02a9abe85540834f SHA-1: 60292534eafada2d607687a8a7abfc9c6755fc3f SHA-256: 249f3a1a958b2b427ea5fb6c81e1675b638f2218f3b9ae6c31fd6c348081984e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://botokaw.ru/strik?utm_term=dc+motor+angular+position+control+using+pid+controller+with+friction+compensation', is likely part of this scheme. No scripts were extracted, but the overall structure points towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/strik?utm_term=dc+motor+angular+position+control+using+pid+controller+with+friction+compensation PDF link annotation
    • https://diwifiburu.weebly.com/uploads/1/3/4/8/134871147/309068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_601d76734c2a1.pdfIn PDF document text
    • https://basafokadu.weebly.com/uploads/1/3/4/7/134706648/3474936.pdfIn PDF document text
    • https://radogatibemif.weebly.com/uploads/1/3/2/8/132815767/abc69d0c971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420612/normal_5fd1d2a73ea18.pdfIn PDF document text
    • http://linza.media/810862103132w132.pdfIn PDF document text
    • https://kofeguku.weebly.com/uploads/1/3/4/5/134587943/kikowapusibikafog.pdfIn PDF document text
    • http://kungfumalibu.com/luwusavojupanoruwoxopbiqhg.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/wojudawu.pdfIn PDF document text
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/0fa2755452.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/7343c.pdfIn PDF document text
    • https://wezunemoxojo.weebly.com/uploads/1/3/5/3/135321606/xarazaw.pdfIn PDF document text
    • https://gurovepulebeguj.weebly.com/uploads/1/3/1/1/131163897/widodopud.pdfIn PDF document text
    • http://ledimpress.biz/89119137538mp1g7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_42c855d9ef834546853ac7f5bc789f2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/battlefield_of_the_mind_devotional_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/vinebetowevevonuweze.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/wopewitifafologutakabap.pdfIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_64ebf793aab24983a6ba17e3acbc78ac.pdf?index=trueIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_6630b73a5b9f4427997b24cf44a9465a.pdf?index=trueIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_0038d47f737f44dbaed00ad7f25e670c.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_cfbeefa077874dcdbf46576f482331ba.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
    • 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_off0001bd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD8A 5660 bytes
SHA-256: a3e20861f6850c8a3f959406af721d077c0b215b7b8e455ea2b5069940bfa38b
font_01_sfnt_off0001d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0B6 12848 bytes
SHA-256: 39daaddd1c2d9053b409877782765757ee057fc722362dc82b92802cda326ab5
font_02_sfnt_off0001fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC7E 16196 bytes
SHA-256: 538a30ce6769b1b2d844f1650319e49058a011fb68e537cd7e0b1d553a7d4e29

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