Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b6c33c3d945e47…

MALICIOUS

PDF

79.9 KB Created: 2021-04-07 08:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb28488fb7041168c1044ff130d32dbd SHA-1: 4f0c74b2cb38ec4898057bc40b77fee64d8e1533 SHA-256: 35b6c33c3d945e478b1495c225555d63887be49ce45b1d850d910b8dab051b03
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it functions as a link farm or SEO spam document. The primary URL identified is https://pelibifir.ru/strik?utm_term=olympus+om+10+original+price, which likely leads to a phishing or malware distribution site. No scripts were extracted, but the presence of numerous external links indicates a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=olympus+om+10+original+price
    • http://dolugonowavogo.iblogger.org/43730055680.pdf
    • https://cdn.sqhk.co/nobipajami/hgUgjXg/19694464749.pdf
    • http://pufivuziviv.mypressonline.com/oxalate_food_chart.pdf
    • https://lufotoloxa.weebly.com/uploads/1/3/4/3/134318907/3244558.pdf
    • https://cdn.sqhk.co/wixexozesila/LehbjgU/download_game_worm_zone_io_mod_apk.pdf
    • https://cdn.sqhk.co/konidadelan/g4gjTgj/temple_run_game_free_download_for_mobile.pdf
    • http://tajeromodovo.66ghz.com/free_general_knowledge_quizzes_with_answers.pdf
    • https://cdn.sqhk.co/moxibusas/gLgeMgf/88091334719.pdf
    • https://ponukikoruxa.weebly.com/uploads/1/3/4/3/134343798/c8180be6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/19327e1e-eb03-4315-94ae-cb4a54faf3c9/how_to_apply_decals_on_plastic_models.pdf
    • http://seviridotif.epizy.com/513364877.pdf
    • https://uploads.strikinglycdn.com/files/a02d56e7-d739-419b-a20a-11532e56d172/why_wont_my_toro_push_lawn_mower_start.pdf
    • https://uploads.strikinglycdn.com/files/f4ad57bb-ca5e-445a-bbfc-c53676b8980c/aplicacion_de_modelos_de_inventarios_probabilisticos.pdf
    • https://uploads.strikinglycdn.com/files/cb6f8af6-060a-4136-820d-ba4beabfc4de/wunuzevupajegapi.pdf
    • https://uploads.strikinglycdn.com/files/d9f31e51-5997-4edd-9e42-40e869897feb/what_are_the_squishmallow_names.pdf
    • https://uploads.strikinglycdn.com/files/56b96a36-6fd6-4a3d-b8a4-ee568e6c1687/norton_anthology_of_american_literature_volume_c_table_of_contents.pdf
    • https://uploads.strikinglycdn.com/files/1560f1da-2776-4858-b7cc-43579e77b805/euro_pro_sewing_machine_manual_9130c.pdf
    • http://zikoliduxa.atwebpages.com/vasixisoduwinomaginu.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_off0000fa3d.bin
ce9ee53a6c2d379047ae94991d894ec76b953431da34c17dd12ad1ab6ae0df2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 5576 bytes
font_01_sfnt_off00010d29.bin
697ead59eff7cd05c5caad4eae12576b75b22f7fcc79c6a6a28c17f3d71343c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 11100 bytes

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