Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15f6c51a8a3e392…

MALICIOUS

PDF

71.8 KB Created: 2021-02-23 22:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 15473cd1406d8e0dba4182820d2bd6c2 SHA-1: 590737903340978deda60e717c97d7f22365da64 SHA-256: a15f6c51a8a3e39254da0020f7a11a0ecaf845bfa38ecb0f466b4d53b10bbf82
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=periodic+table+magic+square+worksheet+answer+key PDF link annotation
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/06e52.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/fimotokijevet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_5fd31256d918b.pdfIn PDF document text
    • https://xuwogojike.weebly.com/uploads/1/3/1/3/131380868/571765.pdfIn PDF document text
    • https://vubumixot.weebly.com/uploads/1/3/4/7/134751696/804a9e48323216.pdfIn PDF document text
    • https://jitugexe.weebly.com/uploads/1/3/0/9/130969989/nalakasub_pajuxepetobap_bajojijedidike.pdfIn PDF document text
    • https://cdn.sqhk.co/tirewaku/Yhgjjii/pinata_hunter_3_unblocked_games_77.pdfIn PDF document text
    • https://sosanibizug.weebly.com/uploads/1/3/2/6/132695556/e5e1cf7a67e461.pdfIn PDF document text
    • https://nutikatike.weebly.com/uploads/1/3/4/6/134601603/zitobi_xoxape_mojinebu.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/eDgjvjf/smith_knife_sharpening_system_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/building_foundation_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/91563370641.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/29826711101.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/bimanual_palpation_of_urinary_bladder.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/cash_flow_direct_method_format_in_excel.pdfIn 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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 5880 bytes
SHA-256: a9cf0187c82518cba9fc7988a367eb6ca4b16f47091782fcce689b96a1e82a90
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 9672 bytes
SHA-256: c874c2ca6b73db711ad3574e21e431c31358944eeaa536fc1e76bc489396747a

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