Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81b2ade6e17a9ee…

MALICIOUS

PDF

85.5 KB Created: 2021-03-04 23:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5284aff371fbd6c2a9a3645de5179a3a SHA-1: 2edb6c420cf8538e12b7ffd287c6111e213800a4 SHA-256: f81b2ade6e17a9eecb46c49c99452c40ea51019f97545e625f60890ccb5fe6b3
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, indicating a high likelihood of malicious intent. The embedded links and the heuristic identifying it as a link farm on disposable hosting suggest a phishing or malware distribution campaign. Although no scripts were extracted, the structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://resalured.ru/123?utm_term=how+many+calories+in+el+pollo+loco+chicken
    • https://cdn.sqhk.co/girewobo/Iijrjo0/40904011933.pdf
    • http://dekovag.mypressonline.com/how_do_you_fix_a_leaky_kohler_bathroom_faucet.pdf
    • http://setlyb.online/mata_rani_ke_bhajan_pagalworldgaf2j.pdf
    • https://cdn.sqhk.co/gotuxixovumu/dIfj07G/dragalia_lost_ciella_twitter.pdf
    • https://cdn.sqhk.co/fagiseregu/0hjjdic/ninja_blender_parts_dishwasher_safe.pdf
    • http://raifaisentgo.online/nets_ewallet_software_downloada88ai.pdf
    • http://astrology-personal.online/statistics_for_psychology_6th_edition_published_by_pearsonsyg6u.pdf
    • https://cdn.sqhk.co/fusozuwalas/hgHhjhc/house_paint_ideas_exterior_malaysia.pdf
    • http://allwoman.site/47323267743735hm.pdf
    • http://circleshtang.xyz/used_scag_mowers_for_sale_craigslistnfqxp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pazalijof.epizy.com/38035866292.pdf
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_17197a715bef46659256a7b4c4f2396f.pdf?index=true
    • http://duxegejuw.atwebpages.com/divera.pdf
    • http://tozurome.epizy.com/ccna_200-_125_exam_free.pdf
    • http://sijeregezokim.rf.gd/latest_bodo_video_album_in_mp4.pdf
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_30c672670bda4617aa0e69f254c67746.pdf?index=true
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_4ab3ad32c5794dbf840fa277f038e03f.pdf?index=true
    • http://rikovaniroxatox.rf.gd/wevudapapipavimi.pdf
    • http://xuxamasisovuku.epizy.com/creepy_carrots_worksheet.pdf
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_9512fc8918924de485974ecbc0fc719e.pdf?index=true
    • 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_off00010d7a.bin
a09d760c18e2cc725a30a1bdccf41ef44e5a9d2f545233c5b77f3b2014b836a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 5392 bytes
font_01_sfnt_off00011fb5.bin
34f577dd93be5afc96b3876fe80ec049bbb129cbba3e0b8aaa73d4c413a3130a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 12312 bytes

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