Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0f5a4fab0ab640…

MALICIOUS

PDF

87.8 KB Created: 2021-06-06 13:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ab3acfea5a1b41535a97265ef89c6bbf SHA-1: 57b1c7b548d83805baf79f9772e388ae1e266bc3 SHA-256: cd0f5a4fab0ab64010d3b075b413a940789301e913aa3b4776e13b0acc690cb2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/pbw?utm_term=c+wright+mills+definition+sociological+imagination PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4426261/normal_60b2812f5a7f1.pdfIn PDF document text
    • https://witirasa.weebly.com/uploads/1/3/4/5/134525236/2672e49b3e.pdfIn PDF document text
    • https://dekepopepafeg.weebly.com/uploads/1/3/5/3/135313768/begarosiguledu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5fe90c8071e74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_60219a645e462.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/bixix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_60273055a113f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fd660a8aee02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496577/normal_606e55790b890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5fcd08841f7d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5fe448d1a9288.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/85b3f0b.pdfIn PDF document text
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/1796342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467975/normal_5ff87fb917784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_604dbc255c015.pdfIn PDF document text
    • https://kunipasufit.weebly.com/uploads/1/3/0/8/130874165/46ccb3ba567f.pdfIn PDF document text
    • https://nugesipepisi.weebly.com/uploads/1/3/4/0/134042061/1578822.pdfIn PDF document text
    • https://nokafixawawi.weebly.com/uploads/1/3/1/6/131606940/9366401ea42f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_6044d89644d30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://veweran.pbworks.com/f/download_antivirus_smadav_2019_full_crack.pdfIn PDF document text
    • http://mifudatu.pbworks.com/w/file/fetch/144689694/arabalar_imek_hz_hile_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 5336 bytes
SHA-256: 1cd2daf6039e9a4c63da1dad3797f9ab4b9c5029ce00bdb36054a5ff803821cf
font_01_sfnt_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 11112 bytes
SHA-256: 684c43d8aee3bc531a4b28adf23fbd2154a37bbd86b8392572198637714b9329
font_02_sfnt_off00014399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14399 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3