Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4239052820b5cf4…

MALICIOUS

PDF

83.7 KB Created: 2021-04-04 07:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29bfc2bedb4c85a705c579012980d44f SHA-1: 2ef45e614d29812d516d51f082a68cb4efb832ca SHA-256: e4239052820b5cf4fda675791b186bb02f952e4d5ae0174765cdb59497f7f2bf
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. This JavaScript likely redirects the user to external URLs, such as the identified `https://nipisod.ru/award?keyword=teorias+acido+base+pdf`, which is part of a link farm on disposable hosting. The PDF's structure and numerous external links suggest a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nipisod.ru/award?keyword=teorias+acido+base+pdf
    • http://nowukusox.mypressonline.com/best_bank_exam_books.pdf
    • http://giveaway2020.info/41946212853yjc6t.pdf
    • http://puzexijabin.mypressonline.com/21970496361.pdf
    • http://veruvipavopa.getenjoyment.net/gaxagupopuvojenimiwamok.pdf
    • https://cdn-cms.f-static.net/uploads/4461481/normal_6041dc8ea9bd2.pdf
    • https://cdn-cms.f-static.net/uploads/4501028/normal_605b565e3213d.pdf
    • http://form-copyrightservices.com/la_fenomenologia_del_espiritu_gratiswpga1.pdf
    • http://pokypka.xyz/brave_new_world_revisited_aldous_huxleyl1e34.pdf
    • http://copyright-security-ig.com/xakamiloxakezov6w08.pdf
    • https://cdn-cms.f-static.net/uploads/4421210/normal_5fe67113869b6.pdf
    • http://sogejovep.mypressonline.com/vegetarian_indian_cooking_with_your_instant_pot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b87145a9-fd88-45b5-a163-310a56dbdb43/nerozovobanev.pdf
    • https://uploads.strikinglycdn.com/files/2d604bea-f04c-409a-8645-3377ee767d20/23526829547.pdf
    • http://bumejefivoxigo.myartsonline.com/zogilaxugakeziwilezajewu.pdf
    • http://legokejapo.atwebpages.com/xibolo.pdf
    • https://uploads.strikinglycdn.com/files/49124019-d51e-48cc-aa8d-ec824aef194f/dipedepokix.pdf
    • https://s3.amazonaws.com/batiku/audio_songs_list.pdf
    • https://uploads.strikinglycdn.com/files/b9e41d9f-f502-4fc2-8e86-45e234cc10a0/miller_thunderbolt_xl_225_150_ac_dc_stick_welder_for_sale.pdf
    • https://s3.amazonaws.com/fenatagazise/dujigeguf.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_off0001050c.bin
71b2e9d8cbfdb0e67711a565825e56ae397965fbebde96b9dbc830e6c1335df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 5208 bytes
font_01_sfnt_off000116c3.bin
bff6d07a3c22ebd94e0a600e39f5b53ecb6c7874f41d00166c103ea19bf485c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C3 12884 bytes

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