Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00a8e614c3a5c9b…

MALICIOUS

PDF

66.8 KB Created: 2020-12-07 02:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 23513e3ce81d64e971f3a32f4c09132e SHA-1: b0836a7e86000a0c6d4428480458d4234e9ce33d SHA-256: f00a8e614c3a5c9bed153edcb2727773691abdfb3acaa07f7fb8107e088660eb
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/strik?utm_term=confucius+analects+pdf PDF link annotation
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/ac21bb619bd6a92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_5f90e5ee19dc1.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/6a30b1c2-b844-421f-88d0-5a9a8bb0db8c/zanaripowetikofesajudadip.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfbfecb3e0f5771149f1d/1606286339687/bob_and_wheel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/872cbd91-5dc2-45d0-9e32-e7318e7c0f47/kutuget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb348c2-d0c2-4c3a-b61d-af686e7612db/define_inductive_effect.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6cb83cb936d6a06a53c6c/t/5fc8ca41970db930d9c92ea2/1606994497642/rugarileko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39cee40-e1be-4109-b7eb-b16f1bdb5595/ramamup.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/homedics_cool_and_warm_mist_humidifier_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6bf4244e997374a281700/t/5fcac0bf73d16755532fa350/1607123136496/offline_rpg_campaign_manager.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_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 4960 bytes
SHA-256: 3459f99e296dc8eda71c0529e2e08bbcd7510c38f15da09b62a21f9b07131cef
font_01_sfnt_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 10720 bytes
SHA-256: dbf2f9ec32f3375eb49003911b5b873d4985e0c61c88008a222886327245f41f

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