Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c3c762615b540c…

MALICIOUS

PDF

78.6 KB Created: 2021-01-11 13:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8fde1a1c5dbf2f1a94c19d0956756546 SHA-1: 736a0948805dbed981a1691d47e2574147561f16 SHA-256: f3c3c762615b540ce2e0a94cafa6a694205de566fea5c7f2db0bbc5478e25913
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL that directs users to a suspicious domain, likely for phishing purposes. ClamAV and ML classifiers flagged this PDF as malicious, indicating a high probability of malicious intent. The presence of an external URI heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=borges+ficciones+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501041/normal_5fc1471807290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5fa2f77a06a58.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/hcvgicn/wufezajobedojijosomuwavax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369334/normal_5fcd42e85994a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_5fa07b2a1d267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f9a5ccc27193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_5fda20889652b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_5fd5f5139926c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447265/normal_5fce6b7d40308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f8e246d15587.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/dPhdEjf/steam_calculator_tlv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5f91fff5f2b28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nafibanefexex/9350790134.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/lufaz.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/future_tense_worksheets_with_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 4840 bytes
SHA-256: 91b1ac4fbf0f4e39dc9c0321a157dbc7f8f4e4a9239e5dfc27e8bb7f07861416
font_01_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 13224 bytes
SHA-256: 5134d8b553d00cd11dd284318c7d53f93f52a78b712540da947969830ab199b5
font_02_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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