Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31bd7babd5ef7cb…

MALICIOUS

PDF

72.8 KB Created: 2021-02-12 04:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e63daae1e0b2f6d5e5343e18340f8d9b SHA-1: 10584454ebd83d412dc46837673608cac849f8f1 SHA-256: c31bd7babd5ef7cbb897f233a6b789d1312cdd967bf324cc51485090c2fae569
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with numerous links pointing to other PDF files, indicating a SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'chat up lines meaning', directing users to external URLs.

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://leonvi.ru/123?utm_term=chat+up+lines+meaning PDF link annotation
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/78081.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_6007a223622a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fd66289e60c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365599/normal_5fe161282b335.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5ff5a9d062fb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479433/normal_5fe142b37f8b7.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/3833593.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413016/normal_5ff91c2f7aadb.pdfIn PDF document text
    • https://semototip.weebly.com/uploads/1/3/5/3/135386148/ae3620067.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401716/normal_5ff03e8c674c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_601a3df473a4f.pdfIn PDF document text
    • https://farumurul.weebly.com/uploads/1/3/5/3/135326432/sesoxosos-wolunaves.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/109bcf0aa11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422150/normal_5ff68046336df.pdfIn PDF document text
    • https://jifafaxima.weebly.com/uploads/1/3/1/8/131871415/1559278.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/jajuzasalikirut/92454397857.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/afterbay_fishing_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/australia_student_visa_questions_and_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 5044 bytes
SHA-256: 4958fbc5423afa1783101e0fd239657a38c0ae0ace421a622d0ace076f077aa6
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 10636 bytes
SHA-256: 4869fd9c0f3bd1983f9ad471b9274a9e5d6c9990901285444242146a88462ceb

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