Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9a41d6f89eaa46…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 21:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc1cdf35f47f44a3b1b85c7a1ffd6062 SHA-1: 079433133f2b4496a57e57122f4011097af5e367 SHA-256: 8b9a41d6f89eaa46530fff996abcb24966dd4e196588a161ed6e7a2066cdf118
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also includes numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=php+scan+barcode+camera+mobile PDF link annotation
    • http://factory-01.com/js/upload/files/mirupogunenulibebal.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/24480541258.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/24897191612.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251d5ee678---gasigugigixajabagulomol.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/46668802799.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/dunadipazilasutekud.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/vesusodatewedasutapa.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/nukofokabobog.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/74191844172.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210910171621.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/zutuparikasewetelulisodu.pdfIn PDF document text
    • http://pinxedien.net/upload/files/27011161609.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/96378519235.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/13440256884.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/tidazateditubogaduzopile.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/77509657587.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/foxoxoripekiva.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/92939012747.pdfIn PDF document text
    • http://videocycling.info/files/file/vezujelorenukad.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/60716641530.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/resuvogurejef.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321728d2ffb---wejetafisu.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/89773276508.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/12756891631.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_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 10820 bytes
SHA-256: b593a6ab6889553a2a1c43b3ac0ae5938df7af10f0618ec8bdf0faa8b5b11046
font_01_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 17672 bytes
SHA-256: 28f295f505dbf60be6c726685793a10ffeba70294c9e9044935bc39c87398c22