Malicious PDF — malware analysis report

Static analysis result for SHA-256 498a0b93798ffeea…

MALICIOUS

PDF

67.7 KB Created: 2020-12-17 15:10:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bb51469bc169550ca7fdce651911d4a4 SHA-1: b669b3d0799fb8c5079a9344d112dc1c2160b667 SHA-256: 498a0b93798ffeeab20f4a4e9db7c38214d2664186e7565d3a29db022f3d4b5b
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. The file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature.

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://traffset.ru/123?utm_term=sprint+car+for+sale+texas PDF link annotation
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/d51f2446ddddd6e.pdfIn PDF document text
    • https://renalulawe.weebly.com/uploads/1/3/4/7/134735886/rijimaneviz.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/242659.pdfIn PDF document text
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/zosarikivibejeviv.pdfIn PDF document text
    • https://fuletufaxesuli.weebly.com/uploads/1/3/4/5/134523612/45953.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/tiselepov_sesad.pdfIn PDF document text
    • https://murusezikarif.weebly.com/uploads/1/3/4/4/134436274/0d876a.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/fadiwede.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/18e261da-aa25-4650-b514-86e7e70be2c0/halle_berry_hairstyles_short.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/command_prompt_shortcut.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce0b389c32423a38e5892d/t/5fce84b4484b4d2062575c97/1607369909071/unnatural_definition_in_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04bb2aab-6424-4276-8cac-a7126cc3d7b2/xuwapeketakupigaz.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_off0000cd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 5180 bytes
SHA-256: a3e909bec154c3d0fd89907bafeeb13d0e165bf7d836b98b22a667ae96429afe
font_01_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 10348 bytes
SHA-256: 519e3cfe789ede2d0e2c1d4f8c3b6f7d7b1e7614403402d95b477c3537818690

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