Malicious PDF — malware analysis report

Static analysis result for SHA-256 2261c6178330a7cc…

MALICIOUS

PDF

81.7 KB Created: 2021-01-06 08:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74b797f8c07d6ee54922b1832d1d0d19 SHA-1: 7e771f0cd180ed526805dea25089d8f74be2113d SHA-256: 2261c6178330a7cc7cbd40a9be06729548b246fd2e815c1c05dae48366b3614d
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but the primary threat appears to be the embedded links and the overall structure designed to lure users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=jamadar+class+3+exam+answer+key
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/13a33950.pdf
    • https://zuzumapi.weebly.com/uploads/1/3/4/3/134344149/9b6d1acc415b1.pdf
    • https://static.s123-cdn-static.com/uploads/4471240/normal_5fcad8bdbed85.pdf
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/ruvadi-jilolanabol-mofuluxevazuw.pdf
    • https://semopadilined.weebly.com/uploads/1/3/4/6/134696525/3868787.pdf
    • https://cdn-cms.f-static.net/uploads/4425910/normal_5fbfc6ee7a1ae.pdf
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5fcc1a38796dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e67b3630-c5e7-4322-94a8-18a329d9674a/15379960006.pdf
    • https://uploads.strikinglycdn.com/files/487ee355-c3ab-4073-8207-cc6c57c18b14/zakir_khan_tv_shows.pdf
    • https://s3.amazonaws.com/rozebofukixus/walmart_financial_performance_2019.pdf
    • https://uploads.strikinglycdn.com/files/05c8247a-698d-4c0e-b3ae-38f97e02c470/59156628162.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc3a.bin
ab99c9d8f6d9fddae50219204b74161a20169a14ce368be2df4d54485519f6c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 12368 bytes
font_01_sfnt_off000102f6.bin
630857ded414dab254cb52121a6fc06fb1c78adf8cd39c78fa4732fd9af0afc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 5564 bytes
font_02_sfnt_off000115e9.bin
32091eaa17ba51312ea811a818b6f583515024766f262bc016b368fba63370b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 10540 bytes

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