Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63760b8c49892ad…

MALICIOUS

PDF

76.1 KB Created: 2021-02-28 02:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: fd006b6aaf24f9c1958794bca7a6e985 SHA-1: 3a136dd0dd3656128b707473fa165e8bd2201acc SHA-256: a63760b8c49892ade84bb63c349446fcc9869d2c844ad2b3dfda4590b0adce93
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, likely intended to drive traffic to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive content and external redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://botokaw.ru/wix?keyword=jogos+do+pouso+alegre+futebol+clube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407795/normal_603aa8dbb95e8.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/2038784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406501/normal_5ffe736a1fb8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_600fc4ce338f7.pdfIn PDF document text
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/6103573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374535/normal_5ff0e14c9da8c.pdfIn PDF document text
    • https://nijolajosota.weebly.com/uploads/1/3/4/6/134678148/78b24a1f8af1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417813/normal_5fe168e8aabfb.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/53606190307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_601604f66e1b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_603039c6ef828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_6027e84b29bd8.pdfIn PDF document text
    • https://famogapev.weebly.com/uploads/1/3/1/6/131606489/wexexemuxolalepaju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375075/normal_5fef4255c42d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459341/normal_5fc86aa3dca6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_60029f0378071.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/exploring_science_9a_summary_sheets.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_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 5452 bytes
SHA-256: 6ad5a4b47b8b067637746c73f359fd27acca6ab3d727fa2f5b22cc276561663c
font_01_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 12468 bytes
SHA-256: da6a3c4e49baa572fb3d4cac9acc2974d6828e3b476ec9b9f0a3fda4957fc4af

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