Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6538cdc41342e8…

MALICIOUS

PDF

116.1 KB Created: 2020-11-11 15:21:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3f9648466e8d8ec3c064f77d53fee500 SHA-1: f64cfd106f0036eebb88fc6801b24cd9cbb09484 SHA-256: af6538cdc41342e853bb0536e6216879910aa1dbd2656e22fd24fbb92fd542d9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('trafficel.ru') that is likely part of a phishing or scam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links on disposable domains, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=columbia+tristar+home+entertainment+logo PDF link annotation
    • https://xepebujusu.weebly.com/uploads/1/3/4/3/134319702/mupofemoduvafi_tutipemewamujad.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/gopabi-xixiko-donodije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5f9527a566d2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5f9e70c550bfd.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/9a369b84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_5f92104bb9aa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_5fa52a8bd3798.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/vepulakanug.pdfIn PDF document text
    • https://jexiwelim.weebly.com/uploads/1/3/4/7/134717468/vavom-lulokaju-bapixo.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5fa5a5127e852.pdfIn PDF document text
    • https://mogazikazalag.weebly.com/uploads/1/3/4/4/134440800/8311335.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a781437b-146a-4964-8685-adf387818e8a/39515164228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4834c2-bf9d-42a6-9046-042322c09b3c/35719143018.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_off00018cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD7 5144 bytes
SHA-256: 40ad2d8fbebd1d59fbd7a535a43eb98c43731a1c4f55887546e61237afb6c49b
font_01_sfnt_off00019e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E1C 10784 bytes
SHA-256: 5d9139d08bcd6e2395f5836485e0e5bc58a3e990ef37922eab22f4aa6c5222ed

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