Malicious PDF — malware analysis report

Static analysis result for SHA-256 94dd2990f34b81d8…

MALICIOUS

PDF

108.4 KB Created: 2020-12-23 12:27:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3bfc877fe08e2b68341aee63584fce9a SHA-1: d7a6767cb64109c4d9603d048c21555750a86435 SHA-256: 94dd2990f34b81d81c009a1068274aa2b5b33b600e3079e76289b0ceec6bbbbd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?utm_term=postmodern+british+literature+authors PDF link annotation
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/dulesar_mevijukurif_pikifesi_geraxijojumis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5f8e44f697f82.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/vatakefojunib/wekomamatuputajobagedit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59addc6229360ecccea80/t/5fcfe2864711ba6f5a6d7d56/1607459463081/70s_music_oldies_radio_stations_toronto.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/begutomazaruvuwarigibok.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/30788647388.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/takowalepu.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/ibm_i2_analyst_notebook_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/carysil_sink.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/78864002648.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/68963905435.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_off000162c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C9 5208 bytes
SHA-256: 5966b4b64d6ad9e8b7170a04ff1fdf677ab9a5b3ac088892dc1410a85942d29c
font_01_sfnt_off00017447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17447 16816 bytes
SHA-256: 616626b47771c91a114aeff14b8e6ace9b3510f9e04093cebcc917ca4c9089f6

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