Malicious PDF — malware analysis report

Static analysis result for SHA-256 97eafa8ba517ce54…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 07:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 711217c3dde90d1e0a23a0a550a83703 SHA-1: 6d983932d162544f7e4f142369ef612d13265623 SHA-256: 97eafa8ba517ce54e3b740e6677ba3586299da711374b4b7dc4704a5006a9395
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as link farms pointing to other PDF files, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://coretry.ru/uplcv?utm_term=rich+dad+poor+dad+full+book+pdf PDF link annotation
    • https://laznia-radom.pl/userfiles/file/mitidav.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/melatebazumepajemuvezinu.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/gowugafaxadalak.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/wigixixazojobejaravari.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/zufopinodapenezovu.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/42379515408.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210902_C2B69C7348D0CC4D.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed2d08a50---57245011229.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/82942934142.pdfIn PDF document text
    • https://mattress-leader.com/media/lowepozazulepagegikonozol.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/63443691064.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/39430701261.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/mojujudiruxufox.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/piduzewej.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/narukefozulokivoperowofi.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/wemamozelidupuliwape.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613037705e155---35060292332.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/93896916145.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/waziralafotuvanikire.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/varofigikezopefevav.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/pulewet.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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 18164 bytes
SHA-256: a0ed4814d08de32e35ab088e0eb3cca5eaacbc0d9fddf78436eb2206c9ef6331
font_02_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 10592 bytes
SHA-256: a7c7784d5a0a2d2ea039358d6a1ff566478a2af61b99dbd4d4d928aacc0c67db