Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dfad13e7229a05…

MALICIOUS

PDF

76.2 KB Created: 2021-04-06 05:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0320f40b82fd0e419ff95479ea61f144 SHA-1: 23db66c60577b9f197d25a65b5fe1a6de195677f SHA-256: 28dfad13e7229a05bc2d47ec5558c48b338ba061ee03e0b6600e9beed586187e
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/123?utm_term=bmw+e36+auto+to+manual+wiring PDF link annotation
    • http://neyroskakalka.site/music_ringtones_teluguy2iet.pdfIn PDF document text
    • https://nanupiwe.weebly.com/uploads/1/3/1/6/131606486/bae8db7bc381.pdfIn PDF document text
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/28b7a7.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/81325176208.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/14763266858.pdfIn PDF document text
    • https://zutuwukesid.weebly.com/uploads/1/3/4/6/134624341/3258814.pdfIn PDF document text
    • http://gachihyper.xyz/how_to_fix_power_steering_in_2005_chevy_malibuudn5c.pdfIn PDF document text
    • http://instapriz.site/el_pollo_loco_offersdjvds.pdfIn PDF document text
    • https://bixarina.weebly.com/uploads/1/3/1/0/131069915/4931219.pdfIn PDF document text
    • http://nasty666.space/pudulnqat9.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/224d6b.pdfIn PDF document text
    • http://b2b-servis.ru/what_is_meant_by_non_destructive_testing9lns8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_e96537d700694fb0a2c17a5177ee5691.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_86401dadc48749c69c8a4d5d8a4f2e40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/705bf50f-738f-4661-b2b6-5b468acc3201/johnny_cash_feat._u2-_the_wanderer_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8413b07-1b0c-4b7a-862f-908c2561d988/ez_go_golf_cart_brake_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3eb4da-0304-44d3-a255-cc644b25a601/what_to_do_when_xfinity_remote_wont_change_channels.pdfIn PDF document text
    • http://tuparibuju.atwebpages.com/48286807838.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_a9fd567d1a284655ac815e4fa497bc30.pdf?index=trueIn PDF document text
    • http://gosaduzunake.myartsonline.com/characteristics_of_financial_information.pdfIn PDF document text
    • http://wusuposakatoxel.myartsonline.com/c_est_il_est_exercices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301e68ed-84b3-4f0b-9ae2-1f2e67952240/the_accursed_share.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8965e5-2dec-4951-bdad-b328389405f0/andrew_jackson_political_cartoons.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_66b499b0be614c4fab7fe4f4c2959d3e.pdf?index=trueIn 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_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 5288 bytes
SHA-256: 5365b3540b5a747cf72a359973d88b86b673b4226dc745b7440df855f5381dd4
font_01_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 10548 bytes
SHA-256: fd27f938ca7ab85fe53a3f0ac1be0aca5aab05de75acb2a06dd0395f0c679b2e

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