Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc90d52205e85d0…

MALICIOUS

PDF

70.7 KB Created: 2021-06-08 02:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5881f9768606863b767eca78813da270 SHA-1: a8944886e9d2c9a79e205d95e584371e785d2a01 SHA-256: 1dc90d52205e85d076e9e7923d69f3f8710ae761c0c0aa6acbb6f5c55efc66d8
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The presence of ClamAV detection and ML flagging indicates malicious intent, likely for phishing or SEO spam. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content.

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://laborke.ru/pbw?utm_term=samsung+galaxy+tab+a7+10.4+32gb+specs PDF link annotation
    • https://nuwusiran.weebly.com/uploads/1/3/5/3/135321198/3674e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417523/normal_60b287dd73d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445869/normal_60bbddea32297.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/b3077d1ede.pdfIn PDF document text
    • https://pelozaxuji.weebly.com/uploads/1/3/2/6/132680784/7cdb8872585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454679/normal_603453da3bff3.pdfIn PDF document text
    • https://jigejoxipivigif.weebly.com/uploads/1/3/4/7/134731155/befepipevaminunekam.pdfIn PDF document text
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/9674240.pdfIn PDF document text
    • https://leneguvajetuse.weebly.com/uploads/1/3/1/3/131380977/60b405250105600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_60baeb394b330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_6016d0ceb9819.pdfIn PDF document text
    • https://vikuxujawud.weebly.com/uploads/1/3/4/5/134515409/8321135.pdfIn PDF document text
    • https://bezujaseda.weebly.com/uploads/1/3/1/4/131437953/zujagetek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fd6efa903f22.pdfIn PDF document text
    • https://wenajatimox.weebly.com/uploads/1/3/4/4/134480159/8b144e9c27ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuruzinijub.pbworks.com/f/la_tejedora_de_la_muerte_libro_completo_descargar_gratis.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/30969336277.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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 6260 bytes
SHA-256: 4abf24347a99ce5ce94e6d6337008f63847a89c000502d2e6bf0356930dad80e
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 10060 bytes
SHA-256: a26cd4874d6765af41340f08b4f58f62e5028a5f9c268d0aaf002d0d5061b9f4

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