Malicious PDF — malware analysis report

Static analysis result for SHA-256 a619fae799c60814…

MALICIOUS

PDF

67.1 KB Created: 2021-03-22 12:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ae361bca42eb5b8de5d1e08586d69cc SHA-1: bee0a9795674d51f8f28f67b329f026fd7cb3fcc SHA-256: a619fae799c60814d5f8b9852db89eadcb96025357ff4acc95b834800e7b703f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content.

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://vilenefex.ru/strik?utm_term=yamaha+ef1000+generator+reviews
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/6665b03b9e.pdf
    • http://fufejezonodim.mywebcommunity.org/interview_questions_and_answers_for_electrical_engineers_freshers.pdf
    • https://kanelepamub.weebly.com/uploads/1/3/4/1/134132184/1989192.pdf
    • http://filuniguwol.22web.org/mujisuxavadu.pdf
    • http://savozotob.iblogger.org/dapavipezimusow.pdf
    • http://doordash.fun/7199867621m6u2k.pdf
    • http://blaugrana.ru/13935099920kzbqr.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/3355715.pdf
    • http://moitender.org/208237191186b9si.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dufojamimusim.atwebpages.com/wevubave.pdf
    • http://venonoval.rf.gd/64248664123.pdf
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_d56ffbeb66994c54b2d48a4b154dc59f.pdf?index=true
    • https://s3.amazonaws.com/nakuzafol/thirteen_reasons_why_season_4_episode_5.pdf
    • http://xikepidefam.epizy.com/nozeni.pdf
    • https://s3.amazonaws.com/kumasala/bipodakeduliwubujewo.pdf
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_aafd8190f9864e9f848153a6e2fcb3a3.pdf?index=true
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_915ad8038a334626b7e58e08d0c58865.pdf?index=true
    • https://s3.amazonaws.com/senodiw/divinity_2_original_sin_classes_guide.pdf
    • http://xerunur.rf.gd/probabilidad_y_estadistica_para_ingenieria_william_w._hines.pdf
    • https://s3.amazonaws.com/fezenur/read_romance_books_online_free.pdf
    • 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_off0000ca2b.bin
0e4d8efb25a8f8434d487fa4ee5294176fb8e4047718050eb7850c97590289e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 5456 bytes
font_01_sfnt_off0000dcb0.bin
c9033a9ace2006df9a86a6d64b7827c9982bf4b0d7b01cd547c740406b0f0791		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 10180 bytes

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