Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b9253a78a447ee…

MALICIOUS

PDF

76.7 KB Created: 2021-02-26 16:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 863a97e17842aa5339d917f1e3119de9 SHA-1: d348fa3b39870ab4c34dab199328d4abe3c6725e SHA-256: f2b9253a78a447eea215f992030971bba5cf3ddf59f7dd72b2f31dd2d7919fcd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this file as malicious phishing content. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=fitbit+flex+for+sale
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5fdbb84f89841.pdf
    • https://cdn-cms.f-static.net/uploads/4502870/normal_5fd27a96ad283.pdf
    • https://cdn-cms.f-static.net/uploads/4416811/normal_5fe8f284efb24.pdf
    • https://cdn.sqhk.co/soxemudu/TgjAAom/kudujexavakubovu.pdf
    • https://romevezijije.weebly.com/uploads/1/3/4/7/134756673/8508927.pdf
    • https://cdn.sqhk.co/xejadukoxeta/eqtjgiW/92506796545.pdf
    • https://cdn-cms.f-static.net/uploads/4419836/normal_601410a6b48fd.pdf
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5fd0964d19147.pdf
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/podikigupugin-tikixovedipepo-mokijegozisonat-zezux.pdf
    • https://cdn.sqhk.co/zarudaletok/6yijhcC/lebara_australia_recharge_plans.pdf
    • https://cdn.sqhk.co/karadirimose/zRgie26/nogevedopanodobisabab.pdf
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/93a686f3e1370c.pdf
    • https://nedidibizexoba.weebly.com/uploads/1/3/0/9/130969065/4017373.pdf
    • https://static.s123-cdn-static.com/uploads/4366665/normal_5fccc018e3438.pdf
    • https://cdn.sqhk.co/zurefaxenov/Hx0iege/online_jobs_philippines_work_from_home_part_time.pdf
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fca230a1aa30.pdf
    • https://cdn-cms.f-static.net/uploads/4469634/normal_5fda153a68b0a.pdf
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5fff42ee5ea53.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sefabe/84188260030.pdf
    • https://s3.amazonaws.com/bewibiwat/zawofodizovufewokonaz.pdf
    • https://s3.amazonaws.com/golepe/table_of_contents_template_word_2010.pdf
    • https://s3.amazonaws.com/jonora/daily_maintenance_report_template_excel.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_off0000f1c1.bin
04faf6957c51e804b019df436dfe512de621e62e4a02712c84c9824a1fbf4541		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 4924 bytes
font_01_sfnt_off00010296.bin
956cb879f49be49554a1063bc6e0375a2095378624fa022bff6c7b28f034a823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 10236 bytes

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