Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bc24c79532167f…

MALICIOUS

PDF

67.2 KB Created: 2020-12-21 19:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6cdd128695033caf79b6a7ea26959417 SHA-1: 5756dd2f56eaff665d825212eb81155e35d97e12 SHA-256: a1bc24c79532167f2847f648a4f272780855031b16fa14f25e9a00647bd105a2
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the primary URLs is 'https://trafffi.ru/123?utm_term=car+wash+logos+clip+art', which is likely part of the lure. The document body is heavily obfuscated and appears to contain junk data, but the presence of external links and the ML classifier output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffi.ru/123?utm_term=car+wash+logos+clip+art PDF link annotation
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/duxusozugodimano.pdfIn PDF document text
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/zugamebepoxera_jukuzapewazota.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/770527.pdfIn PDF document text
    • https://lisokafi.weebly.com/uploads/1/3/4/6/134694643/5959582.pdfIn PDF document text
    • https://gelujesu.weebly.com/uploads/1/3/4/8/134847850/00a3c0.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/zufaxek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5fbadcd102044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5f8ff9fa444ec.pdfIn PDF document text
    • https://nalovitifa.weebly.com/uploads/1/3/4/6/134600698/5dc0be8.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/xamibebulosaxug/definition_of_cognitive_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db3c1f7b-e3a7-4265-b7d3-08ac39c37378/35005994898.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/jasper_report_subreport_example.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/87983235300.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_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 5192 bytes
SHA-256: ade8befbaec709929ced656ba6f1f05311990eacd699f9076ed21d42244ced58
font_01_sfnt_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 10220 bytes
SHA-256: b3d17f325fcbe28f8ff5902235ee637b429789c972d2df67453800f53e87c646

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