Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c23d526bbc0b574…

MALICIOUS

PDF

71.1 KB Created: 2021-05-15 22:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5e4fbadea4fd7ee658dafcde0deb6016 SHA-1: 287b47c0ffd3a5039ce4617a5f89f88551eed3ab SHA-256: 8c23d526bbc0b574ba42760cce068a94dfcddf59691692c0873412819a76c8d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware by redirecting users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=the+penguin+dictionary+of+symbols+pdf PDF link annotation
    • https://cdn.sqhk.co/xonipavu/jmUAPjg/11794390540.pdfIn PDF document text
    • http://gunodopo.22web.org/geometric_progression_chapter.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/ifVrjeQ/monkfish_liver_recipe_french.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/jgW2hck/dune_cast_2020_harkonnen.pdfIn PDF document text
    • http://xanimupa.22web.org/zobiwepesubomudinus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_605d997965017.pdfIn PDF document text
    • https://dejurepezuneron.weebly.com/uploads/1/3/1/4/131452785/a1475d0794c4.pdfIn PDF document text
    • https://dinowupeguf.weebly.com/uploads/1/3/1/3/131379410/7741042.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/4842280.pdfIn PDF document text
    • http://rubeatyshop.xyz/nawonapajiyyp7u.pdfIn PDF document text
    • https://tamilazubi.weebly.com/uploads/1/3/4/6/134604156/tagejini_sixob_zatekiloma.pdfIn PDF document text
    • http://vezuvujuwe.iblogger.org/kalender_2020_schnherr.pdfIn PDF document text
    • http://vajemax.22web.org/83724109855.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/1523256.pdfIn PDF document text
    • http://copyright-help-center.com/guia_consejo_tecnico_cuarta_sesion_2nagld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470412/normal_602855581db77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwopun.rf.gd/hp_designjet_500_price.pdfIn PDF document text
    • http://dopodisimedu.epizy.com/career_word_search_puzzle_answer_key.pdfIn PDF document text
    • http://tatasuvuputo.epizy.com/anne_of_green_avonlea.pdfIn PDF document text
    • http://bobujosu.epizy.com/gujarati_language_for_windows_7.pdfIn PDF document text
    • http://varezekavon.rf.gd/tokubosutubipazul.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_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 5760 bytes
SHA-256: 643d6a0b0aa8d85c11be51502b245c88a1bbe187486001b09049ed6e789a0b1a
font_01_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 10692 bytes
SHA-256: ee71ed2fc6409b6f3fbf231d7afc18c955e25b4786e0f3df478e6400c31ebd65

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