Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd451fa2670345c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 13:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c18cc12deb8a736f4804bd065ae693c6 SHA-1: c2199a4540bd7aefde874bcb2e0914fd04aee8ea SHA-256: 8fd451fa2670345cf130c50eb3c094cf8bf998b259a3c5cd4e31df7c96c99b5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://philabc.ru/uplcv?utm_term=windows+10+add+linux+to+bootloader PDF link annotation
    • http://vipnovini.bg/root/f/uploads/files/36118703439.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/71611111067.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/74588895084.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/74830908508.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/bisajokutisiro.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/93701599448.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/u5q1jhrdk8nnslmuu8860cb4fk/36620221980.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/kapikovoradoranogomode.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/rilexavazederibis.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/jobejakawamajina.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/ronefekezofodevad.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/tedagaziwukuliriseje.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/29468270127.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/16606489486.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/najozetawijumozix.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210907234552_g171zt.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/warozagolategabezanexexe.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/73773540020.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/52478954849.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/mojorodezotixowes.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/levikejenajak.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/43850916971.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/zotedasuf.pdfIn PDF document text
    • http://christopherdallo.com/file/49048774757.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1af56e7a54170fa470f25e9e2383dd2e/26128084929.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/10792570928.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/nitova.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://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_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 17648 bytes
SHA-256: ddb9c7b057f71446d4f3490d309f16408b3eace9df657077a5f0f4e7aa9e2154
font_01_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 10836 bytes
SHA-256: 548068e07344d64ce810f936d5424051ec3ac0a135abc896234aef9e0aa8307c