Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c16e796b6c50a6…

MALICIOUS

PDF

64.3 KB Created: 2020-11-21 08:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 10a734571be21f2ddcb4ef757ad0fbc1 SHA-1: 165a0bee6705380471d713c4fe07fb48a66d0bb7 SHA-256: b9c16e796b6c50a671b84b3d883ecc649a68efe6fe4b8cad2eb6eace2b21951a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a malicious intent to drive traffic. The ClamAV detection and ML classifier strongly indicate maliciousness. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

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://traffset.ru/123?utm_term=stem+leaf+plot+worksheet+pdf PDF link annotation
    • https://bopilewe.weebly.com/uploads/1/3/4/5/134523270/duneludiju.pdfIn PDF document text
    • https://gikusevenax.weebly.com/uploads/1/3/4/5/134529244/dirogurezumamelo.pdfIn PDF document text
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/xabomawison.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/zerejibixupav/48346437729.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/weset.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/86853271389.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/blockchain_revolution_portugues_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/biology_class_11th.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/database_benchmarking.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/gakago.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/71412230090.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/admin_dashboard_template_angular_4.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_off0000c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 5540 bytes
SHA-256: 80e612db63a695bc5cee5d2352798d87b6d617e200368df88d4d6c616ac4c31c
font_01_sfnt_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 9848 bytes
SHA-256: f2a41677381c82a6a0f4d98cac686c4746a475209ed749c20a2e479c50c1844b

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