Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f87fc1602b5abd…

MALICIOUS

PDF

76.6 KB Created: 2021-03-19 05:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 598685de5153916b716dee908ebf49c8 SHA-1: 9f7de41b4182bd4273a618f3b764f1b535f9878f SHA-256: 57f87fc1602b5abdcedf79ea2f528bb968b0562b7030a7fd39a509f9fe025f94
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The presence of ClamAV detection and ML classification strongly suggests malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

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://ponafet.ru/wix?keyword=polearm+build+pathfinder
    • https://cdn.sqhk.co/xexisini/CwgdghM/candlestick_patterns_trading_strategy.pdf
    • http://cheatyou.site/mechanical_engineer_job_description_australia82p8i.pdf
    • https://cdn.sqhk.co/zidexamuwela/cgeGyhi/wutawogaraluk.pdf
    • https://cdn.sqhk.co/kinerufi/8jVYjeH/egg_wars_2.pdf
    • http://ejinaya.com/ovipets_breeding_guidejq5yc.pdf
    • http://copyrightproblem.com/asma_bronquial_pediatria_2018jwrks.pdf
    • https://cdn.sqhk.co/godereliku/fEt6ijO/cbse_class_9_science_notes_free_download.pdf
    • https://cdn.sqhk.co/salefudodid/nhhQnib/17005121605.pdf
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/8486097.pdf
    • https://cdn.sqhk.co/zogowefu/gf4iehi/nvidia_physx_games_download.pdf
    • https://zodutobaziji.weebly.com/uploads/1/3/1/4/131408241/gevar_zexivofixuzaxo_pamotop.pdf
    • https://cdn.sqhk.co/duloputemab/WCgeKib/62851588242.pdf
    • https://cdn.sqhk.co/bidusowo/6iiVhZ1/11075822943.pdf
    • https://cdn.sqhk.co/rorezina/ijYYjeL/74709795511.pdf
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/vutituxazipirijepa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/31bc7e5c-22fc-4651-9cec-aad1d72699a7/can_you_sue_for_defamation_of_character_uk.pdf
    • https://uploads.strikinglycdn.com/files/c5f759a1-52de-4431-8be8-04285d75333b/46813289436.pdf
    • https://uploads.strikinglycdn.com/files/82f931df-bbec-4054-9ab3-389471ab0248/how_to_build_a_home_office_in_the_garden.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_off0000f094.bin
12b774044b7231ae44918e06cc0cfeebe2ae172835bd267c18e822854ff4af73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 5244 bytes
font_01_sfnt_off00010237.bin
627643ecf55a4d306169bca6fa9c03d3f704a5e5ae82a7cda7f41c5443474959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 10220 bytes

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