Malicious PDF — malware analysis report

Static analysis result for SHA-256 085d7c94db10db85…

MALICIOUS

PDF

70.9 KB Created: 2020-12-21 00:35:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4b5b86b0a8306f681514b6cb2d6196fb SHA-1: 11c9a94d875413b14a0e118ff47a55b911f6c139 SHA-256: 085d7c94db10db850bb836d0e020c79d7df04553e547504e4efa0fe8254fdb5b
156 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 5

  • 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.
  • 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://traffset.ru/strik?utm_term=bowling+league+score+sheets+excel PDF link annotation
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bewoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5fa469ee9aea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5f998bb4dcfef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fa0640b9cef4.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/9299893.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/428525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f8b62cabb7fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4c6784e5-ab1a-470d-86f1-345e25ed6243/76232778483.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/1090013244.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/38180536128.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/personal_statement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/gonosuvigovipesa.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/shrink_mac_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_off0000ca56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA56 5152 bytes
SHA-256: 3b021e99cbf0967cb7c3e636b5887c223a43af772dd852efea0b17d35ac0e1de
font_01_sfnt_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 10812 bytes
SHA-256: c7c3e4d1f166b5214aa73775a4befb6c8a849ba3a0c3869bad6c06b9c3893342
font_02_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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