Malicious PDF — malware analysis report

Static analysis result for SHA-256 319d70b01d5563bd…

MALICIOUS

PDF

69.8 KB Created: 2020-12-15 04:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d5e935545f029709c4d294642c256e8c SHA-1: 1a16cb29c40d42325039361dd44338a7fa2af15e SHA-256: 319d70b01d5563bd03ced4e80b0fc906a75f6b90f79a2f3cbb35c7b3ad1788ee
164 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 and presents a deceptive download button. 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.
  • 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://trafftec.ru/123?utm_term=california+indian+law+association PDF link annotation
    • https://kumusexowefas.weebly.com/uploads/1/3/2/7/132741352/9714410.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/lerixewejo_jasuxazilesofog_vogogosobu.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/lanubili/angular_6_formgroup.pdfIn PDF document text
    • https://s3.amazonaws.com/newopetusam/68075840266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ddf05c7-15e6-4f7d-ad70-3fb80699ec27/media_ethics_case_studies.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/stanford_prison_experiment_movie_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3b86fa-6c7e-4019-96a8-fbe6c71e4b22/47579469092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4633e0-5e18-4842-9485-330980a50911/aleph_paulo_coelho_online.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/estate_washing_machine_by_whirlpool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57978282-5bec-473e-a259-7079c1c12990/29308506418.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/food_and_beverage_industry_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec82590a-5756-4346-8452-c8cbc3b20203/buxutuvatulizafikoloboga.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_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 5012 bytes
SHA-256: 9e2710496dd2084ee1e090f93be20e440bd095b84f5c3c7a8439a428eba24e5d
font_01_sfnt_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 11120 bytes
SHA-256: a43af96261c9255581177ecac7159db9f63444b1d0ab62c2ae4bcd8712c64b14

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