Malicious PDF — malware analysis report

Static analysis result for SHA-256 7984cf13d7687e1a…

MALICIOUS

PDF

81.5 KB Created: 2020-12-27 18:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c6099fa591c8c26313712af4130e8ebb SHA-1: 87673cd39bfedfc10cf956637e4eea08e9edde48 SHA-256: 7984cf13d7687e1afd46a52a9b714a242685ebdc6d08715a0a84e6fe91f17eb8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs, with a notable concentration on disposable hosting. The primary URL, 'https://trafffi.ru/123?utm_term=osu+physics+1250+curve', suggests a potential phishing or SEO manipulation scheme. No scripts were extracted, but the PDF structure itself is indicative of 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=osu+physics+1250+curve PDF link annotation
    • https://vifepupu.weebly.com/uploads/1/3/4/8/134886621/depiwirulubek.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/rasabilesu-podaf.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/6592166.pdfIn PDF document text
    • https://likemojinefafus.weebly.com/uploads/1/3/1/4/131406739/vimifixogisa-rukimibul-pibedepawuzaxag.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/misub-sagudobixiset-detexon.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/TcM3Tkn/vevirel.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/wujodibu/online_graphing_calculator_ti_84.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a782f221-1b78-4162-b42e-376f7e1d6551/33568191672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7154c193-ae4e-49c8-8056-838347982dd1/56774122440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd7d6df-9848-46e2-9e2c-9b8c145613b7/cs_1.6_sekmeme_cfg.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/10632192075.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/7587399157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69affb1-4913-4dab-aea4-6e1e66b14533/lee_yeon_hee_husband.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a73422-455b-41c5-a025-7f7587b4256d/wepewimiwonirupanujoxere.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_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 5416 bytes
SHA-256: e97be45602a965fca2ac084219733e1eb67b43e320cad46649733e90394063b9
font_01_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 10780 bytes
SHA-256: d85b60d8e1aef326f4b070754902ff7c3a49e5db15785ecbe6023c36496e38af

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