Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e9fb6f8b8be77f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 18:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1980b848015a2742b35767b37acfa22a SHA-1: 495d5bf6f98874e853fdce92055684c8baf498d8 SHA-256: 80e9fb6f8b8be77fb3c620b05e2c8231bdb9e5e8b128dd492bfff0fa494c2b08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of a link farm on disposable hosting (http://xycrusher.com/d/files/vunawosozosogafudekeb.pdf) suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://xycrusher.com/d/files/vunawosozosogafudekeb.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6sjmvg49i5gafvkkjcvl7hksok/58973599513.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210913162539.pdfIn PDF document text
    • http://www.77ice.com/upload/files/pikakexofaxa.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/laxubafetixujapuj.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/tinovuvexogepaxakefanik.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210918125847.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zulorezejovoli.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/mozajupavesi.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/61205902731.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/903911789.pdfIn PDF document text
    • https://wittnebel.dk/file/fufaxuvixil.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/39249851807.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/lunajabujeletepu.pdfIn PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/86017461489.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161304f189f136---zututese.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/85688158413.pdfIn PDF document text
    • http://lixtech.com.tw/ckfinder/ckfiles/files/19830815921.pdfIn PDF document text
    • https://razredna-nastava.net/files/81981589401.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/nagijukujufiluxugexolom.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/14885943014.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/16571403148.pdfIn PDF document text
    • http://eventechsite.com/files/files/52961128610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=generate+javadoc+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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 18556 bytes
SHA-256: ffce8830eb44adf8594c1d2205075f78a11a467d5d1c9bf2ede45c24738c986a
font_01_sfnt_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 10652 bytes
SHA-256: 90b371d5d436cc0a4ec3fd80b92456acfe62341ae014ad3828ea2e7f399eb52b
font_02_sfnt_off00012ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1