Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff8092cc8329ab2…

MALICIOUS

PDF

151.1 KB Created: 2021-02-22 07:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 40c943c5d2a5931d46bde232c8b66948 SHA-1: d5a0fb0af0f14f26c458c2d4ffa03a8242251687 SHA-256: 3ff8092cc8329ab269cd899b2e6d285fa4add6e9fb56bf9e735d9cf2dba5285c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The presence of external URIs and the ML/ClamAV detections strongly suggest this PDF is designed to redirect users to malicious sites, likely for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/123?utm_term=milk+and+honey+poetry+quotes PDF link annotation
    • http://zdorovie-vashe-vse.xyz/vlsi_technology_plummerc9122.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/higgge1/jatetijo.pdfIn PDF document text
    • http://naturka.space/23549205264fk3js.pdfIn PDF document text
    • http://table-wait.com/how_to_do_a_manual_regen_on_a_kenworthkjako.pdfIn PDF document text
    • http://davufemalolaj.iblogger.org/5639966228.pdfIn PDF document text
    • http://fastpeysistem.online/602255673885fpo2.pdfIn PDF document text
    • https://cdn.sqhk.co/kobedobofepo/ijj8kIk/70s_80s_90s_music_trivia.pdfIn PDF document text
    • http://akvatehnika74.ru/factorization_worksheet_for_grade_96fgtu.pdfIn PDF document text
    • https://malitorenifavo.weebly.com/uploads/1/3/4/0/134017021/209145a91cd8a.pdfIn PDF document text
    • http://mazers.fun/585985385805d4md.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/heSCCij/cozmo_case_walmart.pdfIn PDF document text
    • http://josogub.iblogger.org/exercises_reported_speech_advanced_level.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/0q8geCk/free_uk_dating_sites_2020.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/ca2f76c9fc1ee1a.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/gukevegikopijenupa.pdfIn PDF document text
    • http://tiktoktop.design/top_10_android_phones_listpx9b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000208b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208B7 5224 bytes
SHA-256: 516921cfae63d79fcc7e0a75816c2df698824448b1ef95e42d6880c8232cdb1a
font_01_sfnt_off00021a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A6C 11656 bytes
SHA-256: 638bcc31f0455ccece1a739567675d16539fb51887a6c836ccfb1f7c693bae8b
font_02_sfnt_off0002408d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2408D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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