Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5550bce35aff52…

MALICIOUS

PDF

67.4 KB Created: 2020-12-19 23:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 10c30e5126edb5fbd3dcf442562ef045 SHA-1: 03d8c6f5c41f3f24055db7f14138a62885fd329f SHA-256: db5550bce35aff52e9d0ab8c423437ecce99681d0f0fe448d35a366dc0a9c0a6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs, with one specifically pointing to 'traffking.ru' and a query parameter suggesting a lure related to 'allowable bending stress wood species'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?utm_term=allowable+bending+stress+wood+species PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f8b4ca08c8d4.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/kevujipepovaniv-vudikipeloruno-tukemadu-gotur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_5f948f49c8a41.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/af376e92d6461f6.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/totafelu_lodurajos.pdfIn PDF document text
    • https://dituvilabo.weebly.com/uploads/1/3/4/8/134897320/e6489b2ce2440.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/550f04.pdfIn PDF document text
    • https://jemewifawoboxe.weebly.com/uploads/1/3/4/8/134872293/3847193.pdfIn PDF document text
    • https://sokifavobal.weebly.com/uploads/1/3/4/5/134514189/tagokapemuxiw.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/susopuzupure/ahmet_hamdi_tanpnar.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/42649848778.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/certificate_template_blank_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/63056976579.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/a_world_lit_only_by_fire.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_off0000c9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 5464 bytes
SHA-256: f99243d870f93670666dd3741240438d8bc2479ad5bf3f42b2164b5d86537e73
font_01_sfnt_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 10692 bytes
SHA-256: e312a75b8582adfeceededb4793a26d918735478a911904df8756448d8683539

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