Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a4cf8b5d18fc06…

MALICIOUS

PDF

77.2 KB Created: 2021-03-17 11:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 41cb5d2cdd5c18c435839be5ad7573e4 SHA-1: 19412aa944f338a5231d190714396fd854dc9378 SHA-256: 14a4cf8b5d18fc060e4105d565a8a0dcb92ace1a7f162119c0cb60d8eb38935b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/award?keyword=enneagram+book+pdf PDF link annotation
    • http://myyshooop224.site/cat_run_game_hackh434y.pdfIn PDF document text
    • http://nuzanav.22web.org/how_to_think_and_grow_rich_audio_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471234/normal_601f9de7845b4.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/7XbGd2P/super_smash_bros_melee_adventure_mode_luigi.pdfIn PDF document text
    • https://cdn.sqhk.co/rovujesox/gI0iiY4/tonovajoxikukulasages.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_6004a3bc8d1bc.pdfIn PDF document text
    • http://m-laskin.ru/calibans_war_chapter_summaryr9p7s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5fc8b36733a39.pdfIn PDF document text
    • http://bestgirl69.com/ibm_maximo_asset_management_the_consultants_guidebhs4j.pdfIn PDF document text
    • http://lbaranaydin.com/penalty_kick_movie_reviewps4r2.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/bjgvFw9/xixegapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451355/normal_5fcf27711992d.pdfIn PDF document text
    • https://cdn.sqhk.co/rewanizotaj/iQejdjc/dead_drop_gorgeous_meaning.pdfIn PDF document text
    • http://titanovyi-filtr.ru/dell_e6410_a09_bios_upgrade0gi13.pdfIn PDF document text
    • https://cdn.sqhk.co/dudilirugido/ZhjBngh/45350518061.pdfIn PDF document text
    • http://lavka-karamel.ru/how_to_use_ergo_360_with_infant_insertxhpst.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_a9d286b27f25477cb3a5946df1bf80b3.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_2798ec3d6ce949bbba3cb5448f61e319.pdf?index=trueIn PDF document text
    • https://734bf83f-2de9-4e28-bed8-2c4a7abe9427.filesusr.com/ugd/fc3b0b_86aee1bba9e74006a7a83ce7f77bd186.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_49f23abfc30b42fcb70db68e06f32cfd.pdf?index=trueIn PDF document text
    • http://faxiwig.epizy.com/cell_definition_biology.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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 5312 bytes
SHA-256: 40b7d8ed9a24c3857796e813a7534daec4127fb52b5bcd3618df48b1efa26a57
font_01_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 11128 bytes
SHA-256: ee3c5901f02796af7547261b39a3eb48f51a7427fc5f985d2cc86ce6a991dde0

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