Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a17f02c35eb9f9c…

MALICIOUS

PDF

90.6 KB Created: 2021-09-17 00:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8135813e0ed21ce6c0821f273901524f SHA-1: d5e02be919390e58b3a51f37137e0581d0a52de2 SHA-256: 6a17f02c35eb9f9c8096377c94d7ba1edd15d170831f9b96a53087c7a4014e9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to potentially disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and external links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cofetariafraguta.ro/UserFiles/file/68959058518.pdf In PDF document text
    • http://intertermo.nl/userfiles/file/tosafezagitivadoto.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/74879072792.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613379d720446---zesuvimefoxaxudubavo.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/vafiras.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/8049766375.pdfIn PDF document text
    • http://sushibelovo.ru/files/51961830289.pdfIn PDF document text
    • http://chikatere.com/Upload/files/gurezatopita.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/9045418907.pdfIn PDF document text
    • https://gameclub.by/uploads/files/votudukuxitusej.pdfIn PDF document text
    • http://artdental.hu/editor_up/sanuvigokula.pdfIn PDF document text
    • http://korytnica.net/data/files/48802503040.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/nujopatukatubowum.pdfIn PDF document text
    • http://asfalon.com/__files/file/xetubarewojulu.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/mutipepekerukemu.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/getijolumotozedefen.pdfIn PDF document text
    • https://eklyps.net/images/file/25971855396.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210907091549.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/68300125257.pdfIn PDF document text
    • http://aa-nusd.jp/5201709168.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/91526178992.pdfIn PDF document text
    • http://voijin.com/userfiles/files/66977546634.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/dudiburemutunetaxobi.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/50398047547.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/vokoxabijagenowadeb.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7704c4ac---nimakefinezotigalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=xiaomi+mi+box+linuxPDF 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_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 10120 bytes
SHA-256: 5a8554b4eaa590e57b41595cd61c0d636ad822ec1e3333afc2f4fa727a7f3d94
font_01_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4E 18480 bytes
SHA-256: ee125d8d2aa5fa0aa3643bfeb86677b654e99efe5ecebf9dcde48aaae292b279