Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae905289ef791a6…

MALICIOUS

PDF

68.4 KB Created: 2021-05-31 11:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e0b3ce7045c73deb68d9594003f3a5e SHA-1: 6d3b8d95764affa5225bfccf1b1a07633c62781a SHA-256: 9ae905289ef791a684474d6354e34bb1b597934d079d9e0f17c147450480c134
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a lure for a popular explainer document. Heuristics indicate a 'PDF_SEO_LINK_FARM' and 'PDF_URI', suggesting the document's primary purpose is to redirect users to external sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=thing+explainer+randall+munroe+pdf+download
    • https://cdn-cms.f-static.net/uploads/4447906/normal_605ab0627fdac.pdf
    • https://cdn-cms.f-static.net/uploads/4419642/normal_6063f43358910.pdf
    • https://cdn-cms.f-static.net/uploads/4367961/normal_603961a4bb144.pdf
    • https://cdn-cms.f-static.net/uploads/4452386/normal_606990f8a5f9f.pdf
    • https://cdn-cms.f-static.net/uploads/4403141/normal_600fb99843d22.pdf
    • https://tudekazesabi.weebly.com/uploads/1/3/4/3/134367585/guwusidupotovizit.pdf
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/rutesikinumixizubuki.pdf
    • https://cdn-cms.f-static.net/uploads/4414851/normal_60339ec871a5f.pdf
    • https://nesavelo.weebly.com/uploads/1/3/2/3/132303009/witadubofab-kelenufitekaza.pdf
    • https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/82e789ea.pdf
    • https://mazokaru.weebly.com/uploads/1/3/5/3/135303974/2b2fa75f9.pdf
    • https://static.s123-cdn-static.com/uploads/4415065/normal_5ffc81502b976.pdf
    • https://static.s123-cdn-static.com/uploads/4426080/normal_5ff6215edb40e.pdf
    • https://modatubegawaso.weebly.com/uploads/1/3/4/4/134491319/d179c.pdf
    • https://lefasibemaji.weebly.com/uploads/1/3/4/5/134589759/xiwimopatukidiz.pdf
    • https://gezivotad.weebly.com/uploads/1/3/5/9/135963035/696311.pdf
    • https://static.s123-cdn-static.com/uploads/4482188/normal_60034ce5c7646.pdf
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5fe8561bef57e.pdf
    • https://gokulibom.weebly.com/uploads/1/3/4/2/134266198/detapafezuvaj_kosavezaruzor_purulefitewejo.pdf
    • https://cdn-cms.f-static.net/uploads/4463794/normal_5fd8389e963d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7763a42a-cc0e-43b0-9c25-fb5f8e420183/algebra_1_linear_functions_review_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/c6db6f5b-ebf2-4216-b37b-923620511915/dd_4e_players_handbook.pdf
    • https://uploads.strikinglycdn.com/files/fb929dca-48a1-4656-bda5-80412869c440/gumerapojupuvek.pdf
    • https://uploads.strikinglycdn.com/files/b3f870d1-99c7-4b4b-aeeb-0d9d4ecf1173/a_touch_of_class_band.pdf
    • https://uploads.strikinglycdn.com/files/1b35c274-3461-487a-b72b-0598d468874f/how_to_restring_a_stihl_fs90r.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccef.bin
0046cd798102385dc87aab45e0198af12c37ff857a5446363b71207de8590e69
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 5384 bytes
font_01_sfnt_off0000df32.bin
a1b3ffa7e38d6ade391cfce6b68144aaff8eaf426501c7d0fc1c4a73006bb3e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 10668 bytes