Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1be42669459f3a…

MALICIOUS

PDF

75.0 KB Created: 2021-03-04 16:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eb41326095573b61519f3c9577f70528 SHA-1: bd246409e548a947eca43ff49cbdf29de9f685d6 SHA-256: 6d1be42669459f3aadeab7c30e81cee0ba877b1fcf0e3c174426267c5e0d8dcb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a book summary, attempting to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=cinderella+ate+my+daughter+summary+sparknotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368999/normal_600a570a62895.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/jc1gi50/download_game_gravity_rider_zero_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480162/normal_60090a03a6e6c.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/is_being_flushed_a_sign_of_labour.pdfIn PDF document text
    • http://kabosimoligobe.iblogger.org/writing_letter_n_worksheets.pdfIn PDF document text
    • http://gukazuz.iblogger.org/application_software_information_in_marathi.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/pekagav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ff0035ea36b9.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/1vhiMhe/music_video_maker_software.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/SemQgck/pencil_case_vocabulary_in_spanish.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/14587577869.pdfIn PDF document text
    • https://cdn.sqhk.co/lokojagivel/djfXifD/the_hangover_soundtrack_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_601ddbbb4e282.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/lgdYuQv/download_exploration_lite_craft_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/wigetoxeveka/cjbWhhZ/raza_negra_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/jgghfa0/pulse_secure_not_connecting_to_internet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feworoborisadej.epizy.com/43575628906.pdfIn PDF document text
    • http://minofadejewezup.rf.gd/greedfall_guide_walkthrough.pdfIn PDF document text
    • http://vaguwiraji.rf.gd/gimebabojumedeludigimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8befe27f-47b4-4a6b-945b-fc4ada4bca41/gajigipedenoxenamirutuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6da9f0-cab2-4578-b3c3-07abae18a87f/game_of_life_conway_gif.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_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 5444 bytes
SHA-256: 3293b4cc96fc6451de83e88aa37fc7febbf352eacc679f6e57797dfadb008072
font_01_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 10436 bytes
SHA-256: ce2f71825fbeaa4a357d1ea4ff7bc14773478a12e300f9bef133fdedd4dff6e4

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