Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0a33c33b3d29d5…

MALICIOUS

PDF

123.5 KB Created: 2021-03-10 16:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: acac5905886e73e093d9825eb35a6995 SHA-1: a5f6d0193b6e348d277b343447eb47a4433ff9e3 SHA-256: 8f0a33c33b3d29d5dca40b68af03810731e38c9352aa687d2f7b7d2230500506
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=calculus+1+pdf+arabic PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5ff22ee2676f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_600e33e47e2f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_601b60272719d.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/idjifbs/tidivojowujigijoveka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fefd1951e994.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/jdgdYjb/100_latest_trendy_mens_hairstyles_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460473/normal_5fe15871c2fad.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/9cJiigd/ben_10_wallpaper_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/jdUWBgd/zedikimutinubakunoluvew.pdfIn PDF document text
    • https://cdn.sqhk.co/gagunewatevo/chcjarl/viseditarefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_60207a222be18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_601ce4577793d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_2d5aa74f503f4f0ab9a3af1388adcf85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7e4272-1f32-426a-bbe8-dcc53a738eec/verbos_en_ingles_traducidos_al_espaol_y_su_pronunciacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23399085-77bd-4821-9ed7-ef39d078ac1b/pazupopevuzurinovaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a655206a-5ab8-45f8-a82f-3badeb77029b/32673416751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8b7b99-3117-4fd2-8b6f-458687be5d36/83777185608.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_74bea22e2ddc4a40b1acbf0c05ff17b1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000186ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186AB 5244 bytes
SHA-256: 322754df4a86afeca0cfcfaa5a0ab20a18f6c5b6bc03979d0c0c463d4ee14ef6
font_01_sfnt_off00019888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19888 16428 bytes
SHA-256: 769046b50c0d2147dde24784d7c3dc074b92aed42b495744791e5860ce6a0fe7
font_02_sfnt_off0001cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC10 16112 bytes
SHA-256: 1dc1b93ba8805af470257c82866b29e907d0b64c535949fbf11b885119347665

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