Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a225f3ff25cce7…

MALICIOUS

PDF

69.5 KB Created: 2020-11-14 19:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 566f2c3f96dcbbec4eba29942dbc6e1d SHA-1: a0c875427742f6d51587e65fbbb2781c68d3d320 SHA-256: 44a225f3ff25cce7fee2d4734332184c8fbf71c8d885ca4229d1ea167c76ab1e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://trafffe.ru/123?utm_term=william+carlos+williams+this+is+just+to+say PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5f8b63727cac2.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/vojuxopitedigamominu.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/lubotupedu_ladukomila_xanixef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_5fa45b3036111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f885062382fe.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/0ee5489b.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/5f393.pdfIn PDF document text
    • https://zojokoladateru.weebly.com/uploads/1/3/4/4/134497877/6562954.pdfIn PDF document text
    • https://tesekagaz.weebly.com/uploads/1/3/4/3/134342497/bemavuzese_garefuvij_sijegazib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f87157227cbd.pdfIn PDF document text
    • https://vabofofed.weebly.com/uploads/1/3/4/3/134337048/fb050.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/tutapaxi/lunafototapidasizidi.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/vamajokugupenad.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/mitchell_county_nc_schools_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/blade_runner_2049_torrents.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_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 5324 bytes
SHA-256: 4b464ffbdb062bef826e1af58b628500812c6a693d5b9c035be7229d0b113204
font_01_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 11056 bytes
SHA-256: 8f9a3bfb11058f8d1c07fd27dc254e1f198b65d4c3d7eb020a32114aa1543731

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