Malicious PDF — malware analysis report

Static analysis result for SHA-256 f040dee3597d31f0…

MALICIOUS

PDF

102.4 KB Created: 2021-02-20 03:11:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 767e93f6d6bae4b1b7c44bf6e8ff240d SHA-1: 30e6293c6cc1365a188fc8dffaa24ce789235211 SHA-256: f040dee3597d31f0d3370d6907957d66e304e6a5a571c2b182a174db6541bbaf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://leonvi.ru/123?utm_term=van+dyke+arabic+bible+translation, is directly embedded. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. No scripts were extracted, but the structure suggests an attempt to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=van+dyke+arabic+bible+translation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443372/normal_602b835035c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_600a789789d5e.pdfIn PDF document text
    • https://pesulomerusetus.weebly.com/uploads/1/3/4/1/134109359/3281937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_5fe8e32187e97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461748/normal_602af48824bfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458161/normal_5ff1f4864a8ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_600ce5059caab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_601b519b5466b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_6021011392a16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_600b2870c51b7.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/sasufufa/41786244250.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/consumer_reports_dishwasher_reviews.pdfIn PDF document text
    • http://nizapowedasa.rf.gd/wekoginitowidufatib.pdfIn PDF document text
    • http://sabukizazuse.epizy.com/jnv_admission_form_class_6.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/86564389583.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015a8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15A8F 27988 bytes
SHA-256: c67cc02d1aa1b75217b4ff98dfc74774a06818b75298eb093ac2c6ca2026fb45
font_00_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 5204 bytes
SHA-256: c9f097204f287fb1dfd5ed88897eff2cce33cb94dcfd1b23d20f19026833eaf5
font_01_sfnt_off00012e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4F 14136 bytes
SHA-256: 4e0e5ee1d863ce5081a95d956d34f05628c849b548856cfe823ebbc5e995d7e6

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