Malicious PDF — malware analysis report

Static analysis result for SHA-256 d477b75704cb2bd4…

MALICIOUS

PDF

67.7 KB Created: 2020-11-25 21:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6069f0f6cdece2812d1bb190e6ab0b3d SHA-1: 7b6574975ca9b4bbefe718be668391fac53aca6e SHA-256: d477b75704cb2bd4f4d2db41bfdb07faeb257d128a2a7333e1f111bcdf431104
156 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 contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains including 'trafffe.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=the+avengers+band+brisbane PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411937/normal_5f95b095b8f00.pdfIn PDF document text
    • https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/tunitodojitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_5fb465dbf3730.pdfIn PDF document text
    • https://zesukixugedun.weebly.com/uploads/1/3/4/5/134593530/reromupex.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/povodijirig/21438672650.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/mekudugiponax.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/trumpet_sheet_music_star_wars.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/56694648524.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/29236581982.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/aerated_lightweight_concrete.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/viewer--_toolbar_change_title_javascript.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/kifopiwobaxazivukig.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_off0000cc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC82 5204 bytes
SHA-256: d4fc27c7f1559f328295b269b410e54db9983cc988b4778f44b5cfa306bcd5e7
font_01_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 10824 bytes
SHA-256: 03c96641920d386e4e68300db04251a98f6caae8cbe5af1b4e41a05c77ef27b4

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