Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbfbd1fb4ecc30f…

MALICIOUS

PDF

87.9 KB Created: 2020-12-20 13:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 57bf9d56ef1b44b2e52af1a8657f1fb1 SHA-1: 15405e2c0bf43d6fe7c2b90f58519426065aa5a7 SHA-256: 8cbfbd1fb4ecc30fadd2ec07f8d0e722214dbf1b23598e0d84e59574e0320a6d
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 0.9997

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://traffking.ru/strik?utm_term=war+thunder+ground+forces+realistic+battles+guide PDF link annotation
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/8113729.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/843a2260fbb.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/pixiwokafo.pdfIn PDF document text
    • https://nodopotol.weebly.com/uploads/1/3/4/0/134018708/4010567.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/3866907.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/e2e2b29fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5f8cec071a962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408875/normal_5fc5219f46fe9.pdfIn PDF document text
    • https://jatokogeredere.weebly.com/uploads/1/3/3/9/133997843/kikul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_5fc1ac2e539b7.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/6b417bfa-ac5e-471a-8e1d-0d5ed2e657e4/81903115122.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0d8264a3cc4058a6bb82/1606225286716/kids_warrior_gym.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f8cfeb-3027-459e-9454-f16a35d309c1/zagoravutiwofidadoxina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b999f2-7d3e-4c4a-9683-4dad1d4e184c/introducing_comparative_politics_3rd_edition_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 5436 bytes
SHA-256: 3911b12e739fe970d8d33860d02ce611fd16b65669347637e4daf46b0786a213
font_02_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 11448 bytes
SHA-256: ebba3c186f799bdb6ac3d1622ca50fa8675cc8f4d02e595cd9d05c214b866d41

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