Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c54163bc06710d0…

MALICIOUS

PDF

69.6 KB Created: 2021-01-24 22:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f4d9d01848bcbcef3eaea9c1c86cc5a5 SHA-1: e7711e31f5f5aeadf58b6ef12ee18aecd424ae60 SHA-256: 0c54163bc06710d0359b1ec2e11748436a26b27830f9c4dd3591c125ee717c9a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO abuse for malicious purposes. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to external URLs, potentially for phishing or malware distribution.

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=kitchenaid+professional+6000+hd+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5fcd89e9cc3fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384821/normal_5ffefa4f976ea.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/pixinuzetudilaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378853/normal_5ffd81ed230ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380681/normal_5fcf0c2500b29.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/7289862821850j9u.pdfIn PDF document text
    • http://copalofa.site/warship_fury_mod7aysk.pdfIn PDF document text
    • http://pribor-poverka.site/5391883581194yrg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_5fdc0bb6b2900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5ff25612b3e5e.pdfIn PDF document text
    • http://serdyukov.pro/bafogetiraseninow19mx.pdfIn PDF document text
    • http://idealicaitalia.website/chores_for_6-_7_year_oldsr26ji.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/bb370d.pdfIn PDF document text
    • http://formblckr1.xyz/iphone_11_pro_sms_ringtone_2020_downloadzaol7.pdfIn PDF document text
    • https://tizusetupo.weebly.com/uploads/1/3/1/6/131607013/nuzivorowepasomesa.pdfIn PDF document text
    • https://kupifima.weebly.com/uploads/1/3/0/7/130775493/3d7a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fe2367ce89eb.pdfIn PDF document text
    • http://triple-doska6.club/33826021343jhv03.pdfIn PDF document text
    • https://lifulufo.weebly.com/uploads/1/3/1/3/131379971/7006522.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 5660 bytes
SHA-256: b15106a5969d620e0a202a78c1814186ccb23b47f5f839d4ad400e26bd7461a5
font_01_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 10824 bytes
SHA-256: 76ad76a77f560bc7d6d6cf1fa5472a08337745b38a7cf50f48297ec3bc9c05e2

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