Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a7ec9581c46303…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 00:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a2689b626a2885212b3e119ef241b431 SHA-1: 0b64ce9bb4a32ddbe3348e693559025a8fe59cf0 SHA-256: 79a7ec9581c46303c1f08fab2bbef1d35b6baabf533401caf26dc3b4d4873023
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious document designed to redirect users to potentially harmful sites.

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 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://vilenefex.ru/123?utm_term=tv+catch+up+app+android PDF link annotation
    • https://cdn.sqhk.co/zapusukajev/wiwkjgc/planet_pizza_menu_fairfield_ct.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/ivgehfj/tosuzima.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/ifjahjK/crossword_puzzle_maker_free_with_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460970/normal_5fe259bbc0404.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/XgcZjcg/tegaxizazuxuvovologexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_5fd976b6b5853.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/QgcqwiN/how_to_speak_english_fluently_free_course.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/ihggjYw/snake_zone_io_game_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/S2oicjr/18159700314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478430/normal_60493b1095322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_600bda95e2f62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_60000c092581f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_a827741d5fc74193889d950564d6293f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jobavo/which_is_the_best_call_blocker_app.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/80444310024.pdfIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_54bb875ba8d54aa89bec04e37a9def40.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_bc6d3541fc3f453a9325a5d736ee50b7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 4960 bytes
SHA-256: af3fb9a42ee6187baf4b2f64f4db7e7dc3f84877eaba8606ecf1eb44efe43894
font_01_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 10956 bytes
SHA-256: 3d69e7a522cd2347b56cfd3012e0b94a981b67f6841d36d83500173c6d95dceb

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