Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f34422486d211b3…

MALICIOUS

PDF

67.8 KB Created: 2021-10-03 06:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a03a253f73263da395fc1bd6179ed8c6 SHA-1: 5dd2db2f85786c8b8a1de76b3ed0851cdb7f30b3 SHA-256: 5f34422486d211b3bdd3fbf7cf7f192a931de39bf524d37ae33337210238bd07
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image lure, a common tactic for phishing or malware distribution, and contains numerous external URIs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to a second-stage payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=sonic+runners+reloaded+download PDF link annotation
    • https://aquatrustfina.com/userfiles/file/99953530200.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/winugodewi.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/narirawawe.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/10632446737.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/41561097515.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/23956100470.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/gimasugaxibebejukodu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d322aed68---36801722120.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1632801018.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/nepibivij.pdfIn PDF document text
    • http://glassick.com/userfiles/file/3359845696.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/46463025451.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/61942671998.pdfIn PDF document text
    • http://rjt1.org/upload/files/81604746513.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/wimuxubunaz.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/28428044903.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/goboripazimasomekete.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/32201620577.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/xawelero.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/11c9c030bae2f22c1fb0376628e16629/rarizemibinuduvemiku.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/90640001638.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/60252159835.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/bawaredazanoli.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_off0000ada1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 13784 bytes
SHA-256: 6b128e72680b079a0bb6988d679ec3be03fe3de0d5a4e078c9460a8f973c8ba6
font_01_sfnt_off0000cfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 10524 bytes
SHA-256: c2813f37d520f696e34da24d20056cea4e482873d03cbeb0cec125aaf0acb539