Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cb8ce7ebd7534d…

MALICIOUS

PDF

72.0 KB Created: 2021-06-09 10:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: adb41e80f4ee925f80e2da1aaeaf7f57 SHA-1: 95b2ca9bdac451216e58fe4d12528ff856c1d92e SHA-256: e3cb8ce7ebd7534dc011c8bfae0dd021491d1b44e77c42daf373c4cedb0c9eb4
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://synerhu.ru/pbw?utm_term=types+of+organisational+structure+in+business PDF link annotation
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/57624b10f048f.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/7273131.pdfIn PDF document text
    • https://gafanobekifin.weebly.com/uploads/1/3/4/7/134768645/9b91a6.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/5eb08e32c72ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446507/normal_5fcc6080564b4.pdfIn PDF document text
    • https://jejonogukoji.weebly.com/uploads/1/3/4/8/134864124/zusulakiwuduvozekim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_5fd6c4013079e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fd7ddf4012ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_60b7cc92e63a8.pdfIn PDF document text
    • https://kaxozugusejerob.weebly.com/uploads/1/3/1/4/131452826/popid-fegikevoz-moder.pdfIn PDF document text
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/c4db364.pdfIn PDF document text
    • https://sesirolomozanu.weebly.com/uploads/1/3/2/7/132741009/0b7ae6c309e70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_6043ed9b80a01.pdfIn PDF document text
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/b94d979c37178a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_604d34c55547f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144452235/cbse_syllabus_change_2020-21_class_10.pdfIn PDF document text
    • http://xizegopago.pbworks.com/f/what_is_ref_code_s0a00_shaw.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144720675/68868192680.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_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 5376 bytes
SHA-256: d70e1b55f07aac528f0ffcdc5dcc92c13a7b2538f1c6df95af0333d8a740ecaf
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 10072 bytes
SHA-256: f78904ee911d28e77502ae0107f4b69cec9139225f0203f5f3698a44d8459a0c

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