Malicious PDF — malware analysis report

Static analysis result for SHA-256 b958e4de672b518a…

MALICIOUS

PDF

73.6 KB Created: 2021-06-12 20:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 99243d303c794d2743d241ab9ce06696 SHA-1: e644a2e8f48fb76047035ebb71b970e1220cd72b SHA-256: b958e4de672b518af2bc61c0e49bbfb13006d5a37c32869b458461a3edd57a57
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://medvor.ru/pbw?utm_term=pokemon+kiss+under+the+mistletoe+full+episode PDF link annotation
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/5926613.pdfIn PDF document text
    • https://rabibenexu.weebly.com/uploads/1/3/5/3/135319922/0b23a619bb078c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_60431a021c0ad.pdfIn PDF document text
    • https://bogexisamalalu.weebly.com/uploads/1/3/5/3/135320210/9679277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_604187dee3be8.pdfIn PDF document text
    • https://ziperibeletoru.weebly.com/uploads/1/3/4/7/134761266/4436304.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_6001067c3c3a5.pdfIn PDF document text
    • https://nefopenexa.weebly.com/uploads/1/3/0/7/130739549/5742863.pdfIn PDF document text
    • https://kifikutomile.weebly.com/uploads/1/3/0/7/130776046/6da92d41340f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5ff84d80a7c87.pdfIn PDF document text
    • https://zuziraluxir.weebly.com/uploads/1/3/4/8/134899121/vojimivox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491148/normal_5fd809dca4f4d.pdfIn PDF document text
    • https://bepopasexib.weebly.com/uploads/1/3/4/3/134356469/ratakufaropiwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_6005cb3babfaa.pdfIn PDF document text
    • https://kupepepa.weebly.com/uploads/1/3/0/8/130874668/fipolavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_60351e42030c1.pdfIn PDF document text
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/1f98c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutodoromar.pbworks.com/f/luwob.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/f/poxev.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_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 5136 bytes
SHA-256: 09c495f056477c5fe3e04f30bbf48b41ad36bae8460ba7e672275010b2248af4
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 10372 bytes
SHA-256: c3f78260c6029b9ab61c3d9f3c6345568b6b8972f10fdb67d7b18c3edf505b4b

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