Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa2cf9b11e0c64c…

MALICIOUS

PDF

80.1 KB Created: 2021-03-05 12:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dda306cc3e40de4488d54c997e21beb7 SHA-1: 66e7378d100994f6f3da92d4821e439206e3c1e6 SHA-256: aaa2cf9b11e0c64c305ca277e167cb13e6ea767907ca4630a81e8e06a203ef3c
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

This PDF is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm with multiple external PDF links, some hosted on disposable domains, suggesting an attempt to distribute malicious content or harvest credentials. The document body, though heavily obfuscated, implies instructions related to unlocking password-protected archives, a common tactic to bypass gateway security and deliver payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://bologen.ru/aws?utm_term=how+to+unlock+rar+file+without+password PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388162/normal_5feb42c9ce9f5.pdfIn PDF document text
    • https://zofawuzi.weebly.com/uploads/1/3/5/3/135323082/zojuvi_vinedar_lejux.pdfIn PDF document text
    • http://creditactive.info/cules_son_los_alimentos_que_ms_engordan3olv4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fefe47957d9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_60264bb81d721.pdfIn PDF document text
    • https://fumitosebajogo.weebly.com/uploads/1/3/0/7/130740118/gomod_kenunopenifij_golunas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403417/normal_5ff8ffbe4850d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457572/normal_602b9fd0c3279.pdfIn PDF document text
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/8663277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496592/normal_602050eb4644a.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/LnY5gjw/52537334471.pdfIn PDF document text
    • https://cdn.sqhk.co/renosopezare/7NgdvHI/dudotogolefov.pdfIn PDF document text
    • http://olymptrade.buzz/asymptotes_problems4nvmz.pdfIn PDF document text
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/rofuleb_zuzoz_mobukuxizolus.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/ty9hcih/79780242385.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/gg30Chf/wofedoriwomuginedi.pdfIn PDF document text
    • http://hookup157.fun/printable_coloring_sheets_for_3_year_olds34ins.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_5fe842e1dad2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_11b9eda77e294b11ae0bff3b36334dbe.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_d794cf31ef9d4f93be233447f89e99c6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 5360 bytes
SHA-256: d2e4ac2d20c5d65cab8bfc83b986ab78142d12bb338a1c83eac5688f701ba71b
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 12636 bytes
SHA-256: 1fcf076d8145ed38649434420117451e75fcefefe4792abf984a7e80fa92135f