Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3555f737354a14b…

MALICIOUS

PDF

89.8 KB Created: 2021-04-25 02:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 00e4ab853ff1e333c8b94072ad332e3b SHA-1: 940289d17e781a8ae77058346f60bcbc7e17cb6a SHA-256: c3555f737354a14b8a31abec761e9f8a2fb1ba21e3c9d4b99a978649730f2a8d
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and an embedded URI pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The document body, though heavily obfuscated, contains keywords related to printer ink, likely used as a lure to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=hp+7520+all+in+one+printer+ink PDF link annotation
    • https://cdn.sqhk.co/gulanuwe/cBhfqia/20228455577.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/gjflggD/85990670925.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/c8P6Xhi/lefujokaneris.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/iEjjXLB/jedixibalixodajojot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/genijusemu/oasis_water_cooler_parts.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_5630956bb0c34e78a92be154cd2c8388.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6f65cd-fe3e-494f-a013-d2910bcd426e/22274411060.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/how_to_change_time_on_citizen_blue_angels_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/30391870936.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/60247659309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8766b20-6ef9-45ec-8071-d60b82530f39/82024365815.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/cell_communication_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/resident_advisor_platform_18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac23dec-8f91-4da2-9809-2862eb5df498/64039443766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e6b4784-ff41-485a-9e06-c68468a723dd/lg_inverter_5_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b520280-7bcd-487d-b764-6c2390c29f17/winegard_carryout_g2_installation_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b376fb-c25e-4b4a-8bc7-c2edd5b88a04/78481548749.pdfIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_523103cd0fb341adbd82bada21e6729a.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 4924 bytes
SHA-256: 0b515329cda5d5c4651b1189889b7f2c5a6f98fbb2cbaa52f383d7e9c3768cd7
font_01_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 10532 bytes
SHA-256: e2a68045103f5c37c481f67d96b33df2ccbc405b72e4ae901d1a8d83d6cad4e3
font_02_sfnt_off00014bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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