Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24bb890d1acd82c…

MALICIOUS

PDF

66.4 KB Created: 2021-02-11 22:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f040db445692e2670dc9f1b4d655ae98 SHA-1: 43741cfc01222b5efaf07f8e85ffe8469ce3a5f7 SHA-256: f24bb890d1acd82cd416d437136a4faa00c2723b6aaa3163a13621d7bebd9eb2
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, hinting at its deceptive nature.

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://jacksth.ru/wix?keyword=operating+manual+for+spaceship+earth+audiobook PDF link annotation
    • http://fruittea.space/move_relearner_location_pokemon_rebornkrk4k.pdfIn PDF document text
    • http://prizinsta.info/assets_and_liabilities_of_commercial_banks6ojl0.pdfIn PDF document text
    • http://blacktea.space/pregnant_baby_development_week_by_weekbl08a.pdfIn PDF document text
    • http://suzenax.22web.org/82342076673.pdfIn PDF document text
    • http://cuzinfo.ru/facebook_for_iphone_7ugnt2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_60212cd9ac7b6.pdfIn PDF document text
    • http://mif-smeh.space/spooky_scary_skeletons_sheet_music_french_hornhshyy.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/liagcDs/rugowa.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/pajezoxal.pdfIn PDF document text
    • http://paktum.pro/asisa_telefono_informacion_gratuitolyhff.pdfIn PDF document text
    • https://cdn.sqhk.co/liweruruzed/Tjbfsif/zedd_clarity_lyrics.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/6a1a4334fdbf4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404969/normal_6007c4f8dcf7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474720/normal_5fdee6dfb5211.pdfIn PDF document text
    • https://xupumoga.weebly.com/uploads/1/3/1/1/131164417/1aa9da2b76d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dajidagetulawu.epizy.com/82097887052.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_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 5800 bytes
SHA-256: 79ec604c1d8638603e2f93cfc46f57a8231bdf3aa56546a61df594886a13649d
font_01_sfnt_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 10632 bytes
SHA-256: 9f8c66b4dfed50d602428307a2a336e12cc7ad2b1f3bb0a649bae3cb88e6f684

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