Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba260b9c39014af…

MALICIOUS

PDF

77.8 KB Created: 2021-06-02 02:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5459727dfd0454894f4af5ebfd7d4b3 SHA-1: d972bb184f6c4ced1b380c3c0c7481841b2485f0 SHA-256: 0ba260b9c39014af8be73be244b2aca326fe738def956496a7930e11ffe44370
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, specifically as a phishing trojan. It contains numerous embedded URLs, with the primary malicious URL being https://crewmak.ru/pbw?utm_term=kalnirnay+2021+marathi+calendar+march+pdf. The document body, though heavily obfuscated, suggests a lure related to a calendar PDF, aligning with phishing tactics. No scripts were extracted, but the presence of external URIs and the overall detection profile indicate a likely attempt to redirect users to a malicious site.

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://crewmak.ru/pbw?utm_term=kalnirnay+2021+marathi+calendar+march+pdf
    • https://static.s123-cdn-static.com/uploads/4389107/normal_5febc4ad2db16.pdf
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5fddbf761f450.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_601ef89b33e5e.pdf
    • https://xonalofogikovor.weebly.com/uploads/1/3/4/3/134372302/sikoluj_dagulisabexivov.pdf
    • https://cdn-cms.f-static.net/uploads/4412905/normal_606e574d3defb.pdf
    • https://laripevomed.weebly.com/uploads/1/3/4/2/134266376/6541939.pdf
    • https://nawezuto.weebly.com/uploads/1/3/4/5/134595998/12e6ed49094956.pdf
    • https://static.s123-cdn-static.com/uploads/4387567/normal_5fe1a7cc982c7.pdf
    • https://cdn-cms.f-static.net/uploads/4444096/normal_606d0e19665f2.pdf
    • https://gatilesajegume.weebly.com/uploads/1/3/1/0/131070678/fulezuz_gifawe.pdf
    • https://cdn-cms.f-static.net/uploads/4453117/normal_604bcad2cc8cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vatojorisa.pbworks.com/f/8776626252.pdf
    • http://kunixove.pbworks.com/f/call_of_duty_black_ops_3_ps3_mod_menu.pdf
    • http://pojaweku.pbworks.com/w/file/fetch/144462888/23695307390.pdf
    • https://uploads.strikinglycdn.com/files/42af420b-43d6-4ab8-a6bd-8e01d4774afd/lusoravinegedesifu.pdf
    • http://wefolevemud.pbworks.com/w/file/fetch/144481107/power_pamplona_friv4school.pdf
    • http://sofutikajen.pbworks.com/f/digonadigesajuvu.pdf
    • https://uploads.strikinglycdn.com/files/1bc3f79b-554e-4e05-9d34-734c3cd59682/nordictrack_netl_90716_c700_treadmill_review.pdf
    • http://pimepovume.pbworks.com/w/file/fetch/144480678/lomegolobofanuxerig.pdf
    • http://banusiv.pbworks.com/f/background_music_for_video_free_download_mp4.pdf
    • http://mefijunov.pbworks.com/f/solved_arabic_characters_are_disjointed_and_reversed.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a9.bin
28f33b33da138a0022a6ef2a6e6a6ce4ba59623ee8c5b802c9bc51b56426978b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 5612 bytes
font_01_sfnt_off000103ac.bin
7598fbf211cf20230cd52569b55a90ce2a4415cb6ab77aa02448e6e3d2542eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 11056 bytes

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