Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68042807c071acf…

MALICIOUS

PDF

90.4 KB Created: 2021-03-27 19:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a8fe3484192421d6cbab95b116eee2e4 SHA-1: 8694f57d7e127779624a51603ae0eec1adb94974 SHA-256: a68042807c071acf6ea84b2ef455d3fa5381254db994de57bc3dffcf99d824e2
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, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with several pointing to disposable domains and potentially malicious content, suggesting an attempt to redirect users to harmful websites. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/award?keyword=dental+casting+defects+pdf PDF link annotation
    • http://xuwuvewisin.mypressonline.com/is_the_four_agreements_a_christian_book.pdfIn PDF document text
    • http://fuckfrsky.com/disputing_medical_debt_on_credit_report3ddvm.pdfIn PDF document text
    • https://gajevorotaro.weebly.com/uploads/1/3/5/3/135329880/dde1f.pdfIn PDF document text
    • http://eurofamily.pro/phrasal_verbs_con_getckmh2.pdfIn PDF document text
    • http://rodina38.ru/band_vaaje_mp3_songs_free_downloadnt0rm.pdfIn PDF document text
    • http://prod-fruit.space/3ds_max_2018_arnold_ambient_occlusions1trg.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/duzexanuboldj86l.pdfIn PDF document text
    • http://laxofetiduwi.iblogger.org/xetivevofedulewegam.pdfIn PDF document text
    • http://paypallsecurity.com/emergency_survival_kit_list3tojx.pdfIn PDF document text
    • http://lifeeuro.info/gadejibuz1940j.pdfIn PDF document text
    • https://torififaw.weebly.com/uploads/1/3/4/6/134690130/3498300.pdfIn PDF document text
    • http://banuduxirodeb.mypressonline.com/95859520128.pdfIn PDF document text
    • http://vbnmcxz.xyz/58160882764axoc.pdfIn PDF document text
    • http://belkwigs.com/jump_rope_workout_apple_watchvjw7j.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letekafot.rf.gd/90500148540.pdfIn PDF document text
    • http://bexopikirekide.rf.gd/hummingbird_fishfinder_helix_5.pdfIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_f21fe61d31db42789f5944ada47e4328.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_c828434998c7431182ffa328c5ebdbaf.pdf?index=trueIn PDF document text
    • http://zuwolum.rf.gd/les_stratgies_argumentatives.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_3a92c8ea0c26443cbdf036619b6a169d.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_cd5693d363a3448b8b4f7d2f419dd546.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 1920 bytes
SHA-256: 981e86c7e39053306283c7b76eb2b7e782b42b37a7efe4625114fa33ac7f1b68
font_01_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 5228 bytes
SHA-256: 058fee11f47d9db2a474baf3e7571c9e4a01fb899ec7c93d8694638d4d69c8ad
font_02_sfnt_off00013591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13591 11372 bytes
SHA-256: 9fe11db0d1b5ae9b963f10395640a42c48f5fe6385a2e090b631b9af5b54387b

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