Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a27fc6e2f0d856…

MALICIOUS

PDF

74.0 KB Created: 2021-03-22 04:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaf8ec32ed15e7921db3b433849fcfdc SHA-1: b2ed802193f90ff0ffca9cd2372b4b4959c0e0a3 SHA-256: b5a27fc6e2f0d8560db36c0259da3639161c21321364984173f054a520098170
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for phishing or SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://botokaw.ru/wix?keyword=reading+like+a+historian+nanking+answers', suggest a lure to a phishing site, likely intended to trick users into revealing information or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=reading+like+a+historian+nanking+answers
    • https://cdn.sqhk.co/dovawowo/giLjfib/tubal_ligation_reversal_nc.pdf
    • https://cdn.sqhk.co/dexizajifu/hiiRyhd/72917079675.pdf
    • http://xawinagolagiju.iblogger.org/gloomhaven_plagueherald_guide_2nd_edition.pdf
    • https://cdn.sqhk.co/rujiwujik/cAjfjeF/wukexuw.pdf
    • https://static.s123-cdn-static.com/uploads/4462037/normal_5ff71c0aa8aa1.pdf
    • https://cdn-cms.f-static.net/uploads/4423137/normal_604823acc1e2b.pdf
    • https://cdn-cms.f-static.net/uploads/4384152/normal_600c7c6d67251.pdf
    • http://fezibinuzot.iblogger.org/dunanajudixo.pdf
    • https://cdn.sqhk.co/zolokike/EhhgEie/notovojiruzu.pdf
    • https://cdn-cms.f-static.net/uploads/4485818/normal_603778cfb2a87.pdf
    • https://cdn.sqhk.co/xewafazuk/bfhhGhc/numazolegim.pdf
    • https://cdn.sqhk.co/rasufizo/XSgjjhc/nirajo.pdf
    • https://static.s123-cdn-static.com/uploads/4367300/normal_5fcea92e47039.pdf
    • https://cdn.sqhk.co/sunomedude/th7Vjfv/gizovosakeputog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_6e6da9bb9c07458c88b06bf47fe00905.pdf?index=true
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_a96ab9643e0a4b06a0657645155729b5.pdf?index=true
    • http://duzavito.epizy.com/high_wizard_farming_guide_ragnarok_mobile.pdf
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_600a850cfa71489d96bae01db9a97382.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f905b264-fb12-4f31-89d1-78cd485187a2/whirlpool_gold_refrigerators_side_by_side.pdf
    • https://uploads.strikinglycdn.com/files/653ac80f-125d-4e6e-962a-1ea5ea86c78f/coerver_soccer_drills_week_1.pdf
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_2278aa42302b48359950d957815ecb36.pdf?index=true
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_f612eeeca37f47c1ae0f17cd1a171d50.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e508.bin
306d36586f8c731092a47c3b49e07ab1ae095b58cb99226b2b72749bcc68242c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 5248 bytes
font_01_sfnt_off0000f6f0.bin
7712eeee704b9e675b3ae06594ed165756f99a11bd37a512181d40f91ee0552e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 10348 bytes

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