Malicious PDF — malware analysis report

Static analysis result for SHA-256 d426bedeb856c2c5…

MALICIOUS

PDF

76.7 KB Created: 2021-03-11 10:58:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c75e18134349d930f4dfd28b8da48f04 SHA-1: cd06335519dec33f25beec0134c810f2348b625e SHA-256: d426bedeb856c2c52f39826774ec08dc850fc2039713116d139f854e00a7d88e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it. The presence of a 'Download button' heuristic and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to phishing sites or to download further malware. The ClamAV detection further solidifies its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/123?utm_term=adalat+serial+hd+video PDF link annotation
    • https://kifezitiwiwafu.weebly.com/uploads/1/3/5/4/135400929/wemotebobeteneke.pdfIn PDF document text
    • https://jotutavujisab.weebly.com/uploads/1/3/1/1/131164129/9722416.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/jc0gjjf/janoje.pdfIn PDF document text
    • https://vezisadorudaruj.weebly.com/uploads/1/3/4/3/134349324/perupumerube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_6046a05b6016d.pdfIn PDF document text
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/00df8d3b31.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/Thj1uhd/f1_drivers_standings.pdfIn PDF document text
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/6764cf100ece.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/jheawSd/how_to_spin_gun_red_dead_2_online.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/JHoDYgd/likuzotetijunigud.pdfIn PDF document text
    • https://cdn.sqhk.co/siviraboriru/rbWhigh/80351564920.pdfIn PDF document text
    • https://fozejabaf.weebly.com/uploads/1/3/5/3/135305581/1859697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425915/normal_5ff6d135f07f8.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/ehbhjih/atmos_energy_jobs_jackson_ms.pdfIn PDF document text
    • https://sanejivuzagegu.weebly.com/uploads/1/3/2/7/132740711/gesiwedipanaxujadag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_fcda9a16743e496391d61a6618619acf.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_51e028a612624e748328d40345264b5e.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_96827b463e824a77895b43730ad83f83.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_15de1edde29048a49449bcf8c141380e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 4960 bytes
SHA-256: 293474a7cf999ebdea35d6734406c93a69c6a7f5fd367b51a93a7a957351e6b1
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 11624 bytes
SHA-256: 60f7c4052afa39a0d0933222fc1dfcf69efefff845bb4561e56ec54f7b4e7bf8