Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54e2f3f724e88f2…

MALICIOUS

PDF

74.2 KB Created: 2021-06-08 01:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62a270a83e7a0393ffe3e2a83209c047 SHA-1: cf14bbaa20685d5515587ce949b8b7df76d07e8b SHA-256: c54e2f3f724e88f2d2dc6053c517fa3e6840c9cb8ac61836bddb7ad276e44bed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/pbw?utm_term=2019+subaru+forester+sport+maintenance+schedule
    • https://static.s123-cdn-static.com/uploads/4416669/normal_5ff54ea3a91e0.pdf
    • https://xafarigokexugu.weebly.com/uploads/1/3/6/0/136053206/5781706.pdf
    • https://cdn-cms.f-static.net/uploads/4470385/normal_604d9d69e2b50.pdf
    • https://topuwozusap.weebly.com/uploads/1/3/4/8/134869447/nujal.pdf
    • https://cdn-cms.f-static.net/uploads/4374537/normal_600a046828a01.pdf
    • https://cdn-cms.f-static.net/uploads/4481272/normal_60177a8c14421.pdf
    • https://cdn-cms.f-static.net/uploads/4471692/normal_60586f3fd6829.pdf
    • https://rizaxobekame.weebly.com/uploads/1/3/4/6/134698747/57f4c0fa77c9c4a.pdf
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fe600ff3c19f.pdf
    • https://static.s123-cdn-static.com/uploads/4463812/normal_6007d79242442.pdf
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/voporudalil.pdf
    • https://zubujaxu.weebly.com/uploads/1/3/4/5/134585886/105b80faf0127c.pdf
    • https://cdn-cms.f-static.net/uploads/4416810/normal_6042f8c1b8d50.pdf
    • https://static.s123-cdn-static.com/uploads/4481064/normal_5fefc2aac630b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ae03d4cd-5635-423f-b1ff-a70a6851d218/samsung_rf26hfendsr_not_cooling.pdf
    • https://uploads.strikinglycdn.com/files/22569fa9-239e-486b-98dd-ba0ef4b0ec48/piridanosofikubaref.pdf
    • https://uploads.strikinglycdn.com/files/ca0b02be-e3f2-4e43-b047-2158bd24ada6/jiluwozonuwonakupeviwede.pdf
    • https://uploads.strikinglycdn.com/files/688156b5-7cff-46e2-91a5-183fdd91c97d/marbury_v_madison_summary_of_facts.pdf
    • https://uploads.strikinglycdn.com/files/f5bb5351-4695-4c20-9398-fc7974c8970a/xogotakefatojorimiditokoz.pdf
    • https://uploads.strikinglycdn.com/files/9891d182-8975-4211-8cb9-7f04538310e5/dikogozex.pdf
    • https://uploads.strikinglycdn.com/files/8d81194a-8c8e-423a-a131-38b08c5f1ba2/dell_inspiron_n7110_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/b989ac45-e861-41b9-9cf6-0fbe897df0f9/mopibixofikunajojepare.pdf
    • https://uploads.strikinglycdn.com/files/c9ef1628-a3e8-4596-a545-6cbd03905537/how_to_buy_us_itunes_gift_card_online.pdf
    • https://uploads.strikinglycdn.com/files/2945b1a7-5e21-4d17-afbd-d946a117f45c/reznor_radiant_tube_heater_installation_instructions.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_off0000e40b.bin
5c34a62e35784a28f9c2de38d3fef5fa0c5ca6f51ae6626c54da979060420584
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 5924 bytes
font_01_sfnt_off0000f7fb.bin
bc950fde7c791fc0bc28e30a85aa99fb8e5b6b2698d681c94af74f90947b7fa1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 10220 bytes