Malicious PDF — malware analysis report

Static analysis result for SHA-256 775c64a9813f9929…

MALICIOUS

PDF

79.5 KB Created: 2021-05-25 03:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3826ee9da7584b9c5c84a9b1335b4a40 SHA-1: c59e8b410dcc24ff68b85ccc9ec1218e7452e74d SHA-256: 775c64a9813f992937151b6468dadc0ebb0c4de494108e6edffd0c983943ac8a
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as an SEO link farm and a high-severity heuristic flagging it as an image lure linking to an SEO redirector. The primary redirector URL is identified as a phishing attempt. ClamAV also detected the file as Pdf.Phishing.Trojan. No scripts were extracted, but the structure and heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=river+road+saddlebags+website PDF link annotation
    • https://rifivubego.weebly.com/uploads/1/3/1/4/131407021/3978866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_60226104467c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387040/normal_6009925cbd79c.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/sutof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448735/normal_6034419ad52e5.pdfIn PDF document text
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/tukemobixu-wovativezof-dezovexanolib.pdfIn PDF document text
    • https://pusenosegunilo.weebly.com/uploads/1/3/4/7/134705238/tataj.pdfIn PDF document text
    • https://kilewesiviteki.weebly.com/uploads/1/3/1/1/131163613/vesugakuwoz.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/geraromu/lutanafizodexudarunan.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/37018498500.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/jizabosivabipidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf424ec-4f2a-45c9-be4f-d7ae6d10bbab/dunosuburunekaror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e7ad2a-1369-4bac-8a47-f8c300198ae2/tokyo_ghoul_re_wallpaper_1920x1080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa6739d5-81f8-45b1-8977-0eea97a251cb/how_much_is_100_000_dollars_in_1960_worth_today.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/labalatofevul.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/cosatto_car_seat_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399b5939-13bf-4fe7-84d7-ea7619f7f6f7/cyber_bullying_essay_thesis_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/lulodav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11567bc4-ab7c-45c7-b40e-81d1059ff45b/5012500106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32df1bf7-ab89-43ab-8ab8-4a8f02bc7f3c/pillars_of_the_earth_book_2_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5cbf834-c659-4b97-851d-2c666a2c1fed/wefodudubodobanekatuxiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4aeb8e-27c5-4e5f-b80c-301ec4f8b23e/why_is_my_canon_g2010_printer_not_printing_black_ink.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/63928805491.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_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 5292 bytes
SHA-256: 1d186186f9ef7ca1f8682e02f3deba9d3d12c17473f3821467c4bd4e405fe00b
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 11736 bytes
SHA-256: 586918b00feb142ae2b8e3531b3a0615d6339b2b9fa71c5d9848bcfa713edb4a