Malicious PDF — malware analysis report

Static analysis result for SHA-256 6692ae6ae17d7998…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 22:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a82bc2404a25edbfe5cc3562459c6a6 SHA-1: b7f348eab2c51d2d43a10f76c1dbba6d5f45a71d SHA-256: 6692ae6ae17d799882b0f7af8869bdc52308115738b182a9cd090c260ef7557d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous unknown URLs were extracted, suggesting a redirection or phishing scheme. While no scripts were explicitly extracted, the PDF structure and malicious classification imply an attempt to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://vitanov.rs/files/22763314593.pdf In PDF document text
    • http://karlsbach.de/userfiles/files/nomebavelasapinixagu.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/revobevusopubodut.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/jazisulepunuxebodaxunube.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/20471455128.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/lubivudaremewivagikuw.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jojaxevatew.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/84144141020.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/kibipodujewedipobi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/79640615218.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/mituvitoko.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338981baeaf---kaweka.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xukidosoj.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/76929160136.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/93573800154.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/miwuvex.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/lizidenuzasosurivufalet.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/rarejinezafedagibobave.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/bomiwosazixutedasusav.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/lunufa.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/87834929323.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/kulewudulemetabinas.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/zovusujevewiseripurugaz.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/642160e80833de2208675ccbd71ef3d1/66789310271.pdfIn PDF document text
    • http://smirna.pl/files/file/98057426388.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/tifobisabu.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dirakufiziberimisamubam.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/29490442532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tic+tac+toe+game+source+code+in+android+studioPDF 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_off0000c8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 10732 bytes
SHA-256: 4aa820c58aa6db9c13788d2dc3a0058a187234ef58f0e38fdd6c281d2a8dc77e
font_02_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 17452 bytes
SHA-256: 3e1b90accd03318c6dbb1d9381ffd9675721be31f2d83da7f09803e37290d072