Malicious PDF — malware analysis report

Static analysis result for SHA-256 384d266580c91332…

MALICIOUS

PDF

77.4 KB Created: 2021-04-05 08:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ae5d57df7d8acd85dd11f780aeec4ec SHA-1: 828a28b13800e7148fd2dd9d221dd1c525bbe378 SHA-256: 384d266580c9133226d89ce6663fe94fc52ba501d5e6a559e83a8aabaf6e39af
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://pelibifir.ru/strik, which is likely used to serve a phishing or malware payload.

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://pelibifir.ru/strik?utm_term=weber+gas+grill+replacement+parts+home+depot
    • https://lolorude.weebly.com/uploads/1/3/0/7/130775760/wegarikawotep.pdf
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/fd2ee.pdf
    • http://lazakefezives.mygamesonline.org/buwinisudejenebejisokopul.pdf
    • http://pugorot.mygamesonline.org/kadofesekumepefipam.pdf
    • http://vexetifiridik.mypressonline.com/sc_caste_list_in_bihar.pdf
    • https://cdn-cms.f-static.net/uploads/4455178/normal_6065086514b34.pdf
    • http://woberate.getenjoyment.net/16977606125.pdf
    • https://cdn-cms.f-static.net/uploads/4387056/normal_5fdc655a1d69c.pdf
    • https://kedakixesup.weebly.com/uploads/1/3/4/7/134765551/vikoturemasagori.pdf
    • http://tobufupevujuma.mygamesonline.org/arthritis_research_uk_knee_pain_exercises.pdf
    • https://static.s123-cdn-static.com/uploads/4417992/normal_5feb4b44205fc.pdf
    • https://julufima.weebly.com/uploads/1/3/4/8/134884845/4083190.pdf
    • https://rogosibaf.weebly.com/uploads/1/3/4/5/134590501/24ec1c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sikuva/which_diatomic_compounds_form_multiple_bonds.pdf
    • https://uploads.strikinglycdn.com/files/2a208098-4ae3-4b4d-94df-de68cd763af5/sofifilijadigopitudoliz.pdf
    • https://uploads.strikinglycdn.com/files/dbcb86bb-b10e-47c6-8098-32cb6c278646/93744072578.pdf
    • https://s3.amazonaws.com/rujabepifar/sony_xbr55x850c_calibration_settings.pdf
    • https://s3.amazonaws.com/fewunadupop/61687883780.pdf
    • https://uploads.strikinglycdn.com/files/e95f1c60-809c-4156-8ad7-44676274c9f0/how_often_to_change_kinetico_k5_filters.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_off0000f0d4.bin
1ed941a480b2877d9bdcad03d8d038157ddf53ae51f54000cb455d4dc00c4ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 5640 bytes
font_01_sfnt_off000103de.bin
24a799f79ef7f34f8c37473160742a50af8b9ebac969fbb53e964fd4a009339d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10720 bytes

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