Malicious PDF — malware analysis report

Static analysis result for SHA-256 8606d8f443d6f37b…

MALICIOUS

PDF

81.7 KB Created: 2021-03-22 03:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 67363ac83030585bb6a6a9bbd52e76ae SHA-1: 7d3c5536199e3cea4157eb288a34c877c5399f14 SHA-256: 8606d8f443d6f37b7adcde4c1613232bd911bfd8150c6a73328a52545d35542f
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, despite being heavily obfuscated, indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/award?keyword=music+acoustics+and+architecture+beranek+pdf PDF link annotation
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/giganikuxed.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/duxunabirekod.pdfIn PDF document text
    • https://fowerorizer.weebly.com/uploads/1/3/1/8/131856705/fuvigipebep-bopapak.pdfIn PDF document text
    • http://mini-cam2.club/36776558515ta2je.pdfIn PDF document text
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/tulurusebedusek-gitesilu-mupafovamofofa.pdfIn PDF document text
    • http://tendernes.ru/21738985726ee78m.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/apa_handbook_of_psychology_religion_and_spiritualityonyrq.pdfIn PDF document text
    • http://xunajoza.22web.org/jenoli.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/kapumenafetit.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/56000706183.pdfIn PDF document text
    • http://axecheat8.xyz/nusegebotaqq12r.pdfIn PDF document text
    • http://about-fb-support.com/82438898517z3zuf.pdfIn PDF document text
    • http://nefritthebestthing.site/world_of_guns_gun_disassembly_mod_apk69ur1.pdfIn PDF document text
    • http://baugroup.info/peganafezonepadevakerimqmc8.pdfIn PDF document text
    • https://nadusada.weebly.com/uploads/1/3/0/7/130740262/bijutewobeg_nisug_mozipowoza.pdfIn PDF document text
    • http://zamivowupusora.22web.org/wipukaxazitasut.pdfIn PDF document text
    • http://yewes.space/lg_v20_batteryedb4d.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/4084605.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b9bb8d-5f80-4f8d-9794-b90315faaa48/autocad_3d_commands_for_civil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1cdb61-9703-45ad-97a1-ac9ea69e2380/6482172721.pdfIn PDF document text
    • http://nedizilunok.myartsonline.com/sejarah_perubahan_uud_1945.pdfIn PDF document text
    • http://rilokew.rf.gd/bourbon_tasting_notes_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40360ad0-3f95-4145-a30c-7de3691e4663/canon_vixia_hf_r82_camcorder.pdfIn PDF document text
    • http://gejaran.epizy.com/types_of_behavioural_disorders.pdfIn 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_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 5420 bytes
SHA-256: 0da61642e4bc6e7fa6657fa773a179b1fd963b85208908bed3fc25df986d642f
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 11056 bytes
SHA-256: 380bd22c667d384ed99a23f1f3d61aba82c26898f04db8c00b08fb7f99b866e2

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