Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1eab30ac8d7dc7…

MALICIOUS

PDF

79.5 KB Created: 2021-03-23 00:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 537ae833d33de9ce3ad5d01fbb485ed9 SHA-1: 70f6e12e58082492b998ac7f5757e4b72db667ea SHA-256: 8b1eab30ac8d7dc780aa2021020b24ec99de0914e7ced5e89d45c2f98939443d
186 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 ClamAV and 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 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://ponafet.ru/strik?utm_term=perimeter+of+irregular+shapes+worksheets+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470228/normal_5ff29e94d6e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_60551f14070d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_603c44d63b98b.pdfIn PDF document text
    • http://front-glass.website/bdo_online_application_form_2019jjc4x.pdfIn PDF document text
    • http://moymagazin.xyz/491263183704bhvk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_6018e71513080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413986/normal_5fcdd841162fd.pdfIn PDF document text
    • http://copyrighytsupport.com/xapezugonituzuwixuxumrmdtu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_6031600cce2dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478655/normal_6001a9155c5af.pdfIn PDF document text
    • http://sodahq.club/babylon_mystery_religion_ralph_woodrowpnklz.pdfIn PDF document text
    • http://stavki.link/beethoven_sheet_musiciq144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_5fd31bfd62c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_6015bd83714ee.pdfIn PDF document text
    • http://idealica-italiaoficial.site/hibiscus_flower_information_in_malayalam105yd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_5d62b1f24c154e06a97b1896a34ca2f8.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_d3c5ddf33e24429a97bcc072e9fec9aa.pdf?index=trueIn PDF document text
    • https://0633afab-057d-4448-85e1-ac1a97571725.filesusr.com/ugd/66920c_16f0ef0a50a141eba1d7c80a35d37a5b.pdf?index=trueIn 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_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 5612 bytes
SHA-256: eab872f57282cd92ceb1564105a2a07e9e0b5a15186ca768beda70bc58165709
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10896 bytes
SHA-256: 69a5800d2742364e66ce38123d45cb95256ce42ffa5b960d414a56ccaac073de

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