Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d477da0a1f1cb2a…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 16:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6212f5fde38fd33e276a7c618be41f4f SHA-1: 643937b119aae1b41d7a4096cfbf8d853a479c1a SHA-256: 7d477da0a1f1cb2a34260cd88606dfd1b3c0555155b6490a405ce1db6cbf870b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and its nature as a link farm are indicative of a phishing attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://cpgny.com/userfiles/files/12395676839.pdf In PDF document text
    • http://alrehabourhome.com/userfiles/files/85170407636.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2bc57acb---19715565773.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/59998448590.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/36542202284.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/6625793052.pdfIn PDF document text
    • http://brenderup.ro/mm/file/17193251892.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/78366936770.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/zuliwetoze.pdfIn PDF document text
    • http://ccadl.com/files/20210910234625.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613262c98b304---80624568747.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/tikital.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/86767353390.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/2950289748.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/17468308506.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/52319929402.pdfIn PDF document text
    • http://chemicalengineers.ie/images/topuxani.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/gofegoterinikisugat.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/26844166734.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/93021821792.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/74969877301.pdfIn PDF document text
    • https://hirurgija.me/files/jofozogemoroxagas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=calamvale+post+codePDF link annotation
    • 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://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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 20324 bytes
SHA-256: b3fb97d865d95b3db0646dbd35614a721a48d45c89579fd0bb6db445d0860642
font_01_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 10476 bytes
SHA-256: 2dfd2e28eaecd2c4ff65f766239989eaf897d6dd399e8480440d626e0758fd02
font_02_sfnt_off0001365e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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