Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a32791a1e00fc5a…

MALICIOUS

PDF

75.8 KB Created: 2021-04-06 15:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24b99189de6b6a24f60c81ae3e6e6c21 SHA-1: 5ccf8a75c291b6bf89c6f921f65f90ed221fcf0b SHA-256: 0a32791a1e00fc5a3c56d0a5dc5e16b97ef93cc784ec017fd6402dd0f98ab1f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a probable SEO manipulation or malware distribution scheme. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=stihl+chainsaw+manual+ms290
    • http://rowexusaje.mypressonline.com/1999248353.pdf
    • http://spoonnumberone.xyz/porezugufabisezjd6y.pdf
    • http://bumaga.bz/boy_sad_shayari_wallpaper4m4se.pdf
    • https://cdn.sqhk.co/mumepefofise/icb9jVR/9637468260.pdf
    • http://gelchlen.fun/24663460352txc5z.pdf
    • http://vuwefedope.sportsontheweb.net/gasod.pdf
    • http://musomojil.mywebcommunity.org/astm_a1069.pdf
    • http://gafuvufafokujop.sportsontheweb.net/whats_the_cheapest_way_to_build_a_tiny_home.pdf
    • http://suzamajotibe.mywebcommunity.org/vewurif.pdf
    • https://cdn.sqhk.co/viwiratoposu/gjxjiic/kidufofuzer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jisijuvod.myartsonline.com/how_do_i_use_ecg_on_apple_watch_3.pdf
    • https://s3.amazonaws.com/lefemijip/shell_scripting_interview_questions_for_experienced.pdf
    • http://timerojulawu.myartsonline.com/voropupapefolaji.pdf
    • https://s3.amazonaws.com/zuwimadaneb/french_vocabulary_games_app.pdf
    • https://uploads.strikinglycdn.com/files/0fb48f08-261e-4113-a213-9f345a8c75aa/shimano_di2_charging.pdf
    • https://uploads.strikinglycdn.com/files/aed31d66-656e-42f1-af71-eb23b3be271d/5238901704.pdf
    • https://uploads.strikinglycdn.com/files/429057c7-cb87-47ac-b0ea-fca0ac2099cf/59058573746.pdf
    • https://uploads.strikinglycdn.com/files/61a31742-678b-403b-bb65-0c6b5f43086c/zupoke.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7c.bin
fdb7b8ce56668dc6f43407e64ed4aecfddf03b50ae4e639040a8b20152889833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 5568 bytes
font_01_sfnt_off0000fe53.bin
13848799ee79e1cd03a0d7e14be3228368bf0d7103a93ae93388df6f40acf7ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 10640 bytes

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