Malicious PDF — malware analysis report

Static analysis result for SHA-256 2182ac7603dfde7a…

MALICIOUS

PDF

67.3 KB Created: 2021-03-27 11:03:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6811b042221b40c1c9b93a159e6f9fd8 SHA-1: 9216841fd244e7f890ce8e383c9fd9594c777e78 SHA-256: 2182ac7603dfde7a0453c6d983bd0b180bc19d7d4710e6c55ed7d4de0d570d12
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=how+to+make+an+easy+origami+paper+plane PDF link annotation
    • https://cdn.sqhk.co/delinilipo/hbjhxgj/71199642471.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/jbhgGjf/46973847967.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/cjcLGgj/sedusugura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_605896191bfa2.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/a109145765bff33.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/nEAoiaw/black_diamond_casino_free_slots.pdfIn PDF document text
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/wozutagepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_6020638b7e9a1.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/jetkBib/42204832328.pdfIn PDF document text
    • https://cdn.sqhk.co/sifilefu/Eheifho/44565347252.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/nSDJkhg/80393593301.pdfIn PDF document text
    • https://tasogedogag.weebly.com/uploads/1/3/4/6/134606554/4009973.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusori/nalc_pay_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/car_racing_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/9120253752.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/gepikupiwuwupi.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_84bd779c48374dc1a9d3f7a2d834ae92.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_1a292f0d7fee4da6a8176f97d83d28c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/filidabut/zudebofile.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_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 5360 bytes
SHA-256: 789edea41f8dc90a0f05abb686a35eb89f384438484b8ef67e08476be7425ab4
font_01_sfnt_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 10104 bytes
SHA-256: fd24eae6e0acfe3b4a60c7f95db3c42305ab50adc94cdccb964c71cc67745a39

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