Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a5673e12c3345f…

MALICIOUS

PDF

75.7 KB Created: 2020-12-18 10:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c775b56740dc5d2edb4daf4f120b7fe6 SHA-1: 97fca1d1c5236e9bfecf08ca5b048a1fb17727b6 SHA-256: 77a5673e12c3345f756fe3c6b569d2bf6331e8297449bc677a8f3dd92ae73df6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links, 'https://trafffe.ru/strik?utm_term=canciones+de+misa+argentina', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended lure, but the presence of a link farm suggests an attempt to drive traffic to malicious sites.

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://trafffe.ru/strik?utm_term=canciones+de+misa+argentina PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419441/normal_5fbc5fe6aeefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377936/normal_5fa89b0cdacf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415756/normal_5f9f6cd93fdd0.pdfIn PDF document text
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/9944785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_5fd0ac0e3de2e.pdfIn PDF document text
    • https://wudizibi.weebly.com/uploads/1/3/4/4/134477582/sebubutonoxosopaxaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_5fa6aee73fd2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_5fb5c67fb8e29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5f95918a86575.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/tuzakifezara/chrome_extension_android_screen_sharing.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/7127214653.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/a_most_violent_year_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752807e7-ec40-4075-a050-52c6628c69a9/lasawapipabovivavupatoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa443cc-af69-42a2-bdeb-525aa1e83941/universal_remote_control_for_apple_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdcd922-b4be-463f-970e-eed024d1a439/46495341469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a88e3b31-4d5e-405f-97ba-6bbf3d41e791/88804513376.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/darejawajoxex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27435f9-388d-4a35-822a-3060721df253/33353332967.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_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 5132 bytes
SHA-256: 03cad52a2b917a9b1e8dc1a2acac54bcf48c40f7dd964cf4e7d138e30f18be2e
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 11180 bytes
SHA-256: ca690a087161ce5f880fb350f4eb048cc3f8bcbbeba19031680079bd90ce557d

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