Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10499d7887ad4e9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 13:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2988235d0da14efac44a7f2da46172e SHA-1: 547b144f4a2f63f646789fb3caeb1533da6a0448 SHA-256: f10499d7887ad4e9e2f787d7d8b0f77927da95c6cd3fcc84a215f6aab47ee541
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the structure and numerous external links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 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://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/35794249181.pdf In PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c88c0a4fa1fd0dd00738ecae1b010b63/leletoroliv.pdfIn PDF document text
    • https://questyme.com/userfiles/file/fanepitek.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/tovurazat.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/41e2d90f20ca784cb2c676491e1450ae/pubapufa.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/26676799047.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/woregep.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/dogutezivenepumoxezejuge.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/tumarituxewokoj.pdfIn PDF document text
    • https://ibextrail.com/editor-images/jukeranipepe.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/guzoxaxagak.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/diroveseturoxip.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/lowuwomuwi.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/farututenitabekajunivoxa.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630823701/files/getenokewujulotixivuw.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/70587999599.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xexageboxufa.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/81744200186.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-07/images/files/63396252981.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/26313408206.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/19759303948.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///63820898887.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/59941831740.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/sixesakitudamezozutibunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rbi+baseball+18+apkPDF 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_off0000b1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FC 16016 bytes
SHA-256: b553279017e621cbf739d1e5f1cf50b4fe2280943c0391ac004ae646ad9c5666
font_01_sfnt_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 10360 bytes
SHA-256: 1b1d968d72cbfa8cafd35623eb449f9eb42daaf27f59eea2a776ad6f7fc62695
font_02_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1