Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a8a35af4147557…

MALICIOUS

PDF

96.7 KB Created: 2020-12-11 04:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7ffe66e688d63d7b279e8e87b1cbd86a SHA-1: 907c7717ee8d3357421381793513c895e546c4c1 SHA-256: b3a8a35af4147557807f73e75d3a8a2143a2c98bc7b7919d2f85b87e0447a019
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous external links, with one pointing to 'traffking.ru', suggesting an attempt to redirect users to malicious content or services. The ML classifier and ClamAV detection further support its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffking.ru/strik?utm_term=da+pam+25-380-2+pdf PDF link annotation
    • https://lodofimedama.weebly.com/uploads/1/3/4/3/134327961/rijereka_jituzolelifivor_lawewujigim.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/vutoz.pdfIn PDF document text
    • https://simidolipuxemit.weebly.com/uploads/1/3/4/4/134486986/6761301.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/jiwisigetizoxif/purble_place_free_for_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdf613169f3e188a7a5d55/t/5fcebd2d6df3f351a66d891c/1607384365909/liwoxoru.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb79e5c7695ca99bb922/t/5fca719695a7962a5bc250ee/1607102871291/gufoxuzowofajukadi.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/xedexadavejuwugesas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b5c50b-297b-48e8-8c23-1e55d9bf5714/34519163595.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/exo_mountain_gear_1800.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/75417185797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca48ec46-764c-47dd-b264-b52649320cff/exact_trig_values_of_special_angles_answers_with_work.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_off00013f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F87 5668 bytes
SHA-256: 1f3d9bee3b5f69f20858a5d4e5dd0469c15a368876958cecff697e80aa2c2cac
font_01_sfnt_off000152e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E2 10500 bytes
SHA-256: 034518769997e40cce8cded44f8dd031c897909188953a98f7a8017beb53fb63

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