Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d2227075cdd9b5…

MALICIOUS

PDF

77.5 KB Created: 2021-01-02 12:34:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 331df36b525c1e2821f571642b072c26 SHA-1: ee6dc6c4470c205a85fba3d6939a77ffb2543138 SHA-256: 25d2227075cdd9b557e0596f43d4801e72c7d1d80df3585090d01f22a2b89b76
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. Several heuristics indicate this is a malicious SEO tactic, with one URL pointing to a domain known for hosting malicious content. ClamAV also detected this file as a phishing trojan, suggesting the links are intended to lead users to malicious 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://traffset.ru/aws?utm_term=utilitarianism+theory+in+education+pdf PDF link annotation
    • https://jiwozipepogi.weebly.com/uploads/1/3/4/4/134462700/xufopopivabas.pdfIn PDF document text
    • https://ruvetuse.weebly.com/uploads/1/3/4/6/134618438/453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5fa85bea60bb9.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/4918653.pdfIn PDF document text
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/lusozunaxakuveku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5fa517aa0ee5e.pdfIn PDF document text
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/rotizon.pdfIn PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/riroxogozipup.pdfIn PDF document text
    • https://vabepazepa.weebly.com/uploads/1/3/4/5/134596671/giwisegixerulup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee16b53-8964-4d40-9a81-09c19e31428a/92707804714.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/lockout_tagout_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/35092412963.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/bubble_shooter_5_apkpure.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_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 5488 bytes
SHA-256: aa55709183d4fc59acaeb4b5ba75ddf90cdec9706c1352cd5751c0c9353107de
font_01_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 10776 bytes
SHA-256: f7c8c556551593d818398cf70f69ff5eb6bbb61377e9cd61c0b3acbfb5b6a2d0

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