Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc036774af1ae4f…

MALICIOUS

PDF

82.8 KB Created: 2021-04-01 06:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 914cb73f01f7685ac16b536de9df60ae SHA-1: 43ce5f16ef3fd2619cc2d70ee3e355e1d8b5dd92 SHA-256: 9bc036774af1ae4f0e0b59352bab6869ce465850f37fe671d23341a77be242e2
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to 'Android gmail backup photos', suggesting a lure to trick users into clicking on the embedded links. The presence of external URIs and link farm heuristics indicates a phishing or redirection attempt.

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://lozipotod.ru/123?utm_term=android+gmail+backup+photos
    • http://dafusunefu.iblogger.org/jedurukemoberewibatorivar.pdf
    • http://mofetopevufije.iblogger.org/78452189416.pdf
    • http://pipopituga.22web.org/20211259924.pdf
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/rugatixeno.pdf
    • https://cdn.sqhk.co/dafibuxoki/cihijaT/nalodatilebimepilevabex.pdf
    • http://bandalet.club/listening_test_4_birth_statistics_answerstk65k.pdf
    • http://golomashvanna.xyz/what_is_the_equation_linking_distance_velocity_and_timezln94.pdf
    • https://cdn.sqhk.co/jenojigise/bhi8lFD/do_hashtags_work_on_facebook_ads.pdf
    • https://xitorudabetibom.weebly.com/uploads/1/3/1/8/131856365/114067.pdf
    • https://gunesuzupe.weebly.com/uploads/1/3/4/6/134679160/2454179.pdf
    • http://zivokuj.iblogger.org/sociological_theory_definition.pdf
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/vupuxoror.pdf
    • http://copyrighthelpcentral.com/algebra_worksheets_8th_gradeytnsm.pdf
    • https://cdn.sqhk.co/kazamepa/njXghIj/91659062354.pdf
    • http://leaninrzpd.site/tujiwokepegogabizupajap6zjh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zoratazux.epizy.com/xewipuxi.pdf
    • https://uploads.strikinglycdn.com/files/3cd5a8e7-4926-4866-8a92-efcd84091fb0/nanajuzazevejizamibedode.pdf
    • https://uploads.strikinglycdn.com/files/cc39c722-e2fa-4037-a236-c4ba8e8dcc56/pagonibuxepefofexugejop.pdf
    • http://remivipe.rf.gd/application_ccleaner_android.pdf
    • http://tobidenarero.rf.gd/50883778683.pdf
    • https://uploads.strikinglycdn.com/files/fc35ecef-e56d-462e-9cfd-428988864add/the_falling_man_hd_photos.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_off000106a9.bin
5a5298f4a282e278b4fb0da2d19f96007cd35725af10c46e87c1319f6735c3eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 5680 bytes
font_01_sfnt_off000119c7.bin
b5086b0fc5e903138e44ced22e7b48448f31ac7cd9a11672c11835001c44186a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 10604 bytes

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