Malicious PDF — malware analysis report

Static analysis result for SHA-256 83688319d9db468a…

MALICIOUS

PDF

70.9 KB Created: 2021-06-03 07:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 02a04073ef73e6d1b9a77fcb1d7f81e5 SHA-1: 6d03d0526d0394b1679eb143c1f842bf31699fda SHA-256: 83688319d9db468ab119031526057fd9652d2a00e1b95e64457527da032e68bb
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, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to a game and application version information, suggesting a lure.

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://krisoc.ru/pbw?utm_term=how+to+set+off+car+bomb+gta+5 PDF link annotation
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/kijodiwarokozimepim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5feb01bae1ba1.pdfIn PDF document text
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/4467318.pdfIn PDF document text
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/madudefosisodeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_60414ae4324da.pdfIn PDF document text
    • https://lutafutenitar.weebly.com/uploads/1/3/4/3/134381418/xabiruvev_monivinu_niwatokowazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492892/normal_603af2adbdf49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_60549eb7d0cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_5fd0dae27160d.pdfIn PDF document text
    • https://mepowubufavi.weebly.com/uploads/1/3/4/8/134858245/6211890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413842/normal_5ff1c51bc750b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixiguru.pbworks.com/f/siwozawep.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422664/gozivix.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144412449/kowevemojopulusirixafuva.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/f/oster_pro_1200_plus_blender_parts.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/jakaganex.pdfIn PDF document text
    • http://mizelabe.pbworks.com/f/rigevalosoga.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144427242/zevuruvotar.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/f/wajosivizenibed.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/tecnologia_3_eso_ejercicios_resueltos_anaya.pdfIn PDF document text
    • http://finebov.pbworks.com/w/file/fetch/144472506/phillies_seating_map.pdfIn PDF document text
    • http://ronakiko.pbworks.com/f/37514315150.pdfIn PDF document text
    • http://lexibitite.pbworks.com/w/file/fetch/144536583/saunders_comprehensive_review_for_the_nclex-rn_examination_8th_edition_test_bank.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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 5488 bytes
SHA-256: 0153965cdb67c5c3747820aba59a1aeef726b72cb58714240f312dc9d6b3f13e
font_01_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 10472 bytes
SHA-256: 44c8cdcf5707dce8515768da4bddec49c70038f3992c35b7505b7924ea05b5b1

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