Malicious PDF — malware analysis report

Static analysis result for SHA-256 6366c34f1f647a41…

MALICIOUS

PDF

77.7 KB Created: 2021-02-15 03:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 12f208fec78446e32773d1f97be3d678 SHA-1: b5f6424d772183c2fa334a6757b9139510b07269 SHA-256: 6366c34f1f647a413df04c7a580e983545b172249e810ce166df549ee809ee86
244 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, suggesting an SEO link farm or spamming operation. Critically, one of the embedded links points to known malicious redirector infrastructure, and ClamAV detected it as a phishing trojan. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=hitman+blood+money+achievement+guide In PDF document text
    • http://tacfitproducts.com/kansai_paint_co_ltd_annual_report_2018nbig9.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/72ef573a8e65.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/9989186.pdfIn PDF document text
    • http://kiluniv.22web.org/gibolemowaw.pdfIn PDF document text
    • http://soldonlittleton.com/menavutul6vvby.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_60237e6f28cda.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/luzufufodijo.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/vozipigisune-risub.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/2439caa68a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368501/normal_5feb517e0c597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5fed6b53e026f.pdfIn PDF document text
    • http://labiosdewonda.com/14145532029iuoob.pdfIn PDF document text
    • http://tamakar.xyz/helicopter_crash_california_2020y93z4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_6014a3db1322a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bepinutarefe.rf.gd/buku_ahmadiyah.pdfIn PDF document text
    • http://lazokobipas.rf.gd/58909678112.pdfIn PDF document text
    • http://gozulejawefufap.epizy.com/windows_10_firewall_control.pdfIn 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_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 5344 bytes
SHA-256: b8b2f4637f695313d962843356efb643e436b2fec824cd26967773fe1b0eec00
font_01_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 10644 bytes
SHA-256: 95cfcf203b980e23959cd469efa975e17340cdae9feab21032a9c3cefecb5858

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