Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c92d8d66fbf7465…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 14:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a82878388e9952049e9612d354bafc3d SHA-1: 1487786697370a34f7dc5b4d32aefb9bf72db33c SHA-256: 4c92d8d66fbf74651919d08145b7e03f6d56f1c49d3ae47ff662b1ea213af245
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and is classified as malicious by ML models and ClamAV. It is designed as an image-based lure with a clickable link, a common tactic for phishing campaigns. The embedded JavaScript likely facilitates the redirection to malicious URLs, such as https://irlanc.ru/uplcv?utm_term=nicegram+for+desktop, which are hosted on disposable domains, further indicating a malicious intent to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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 68 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.
  • 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://irlanc.ru/uplcv?utm_term=nicegram+for+desktop PDF link annotation
    • http://bacvietexpress.com/upload/userfiles/files/11093218942.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/33742715396.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614223dc2c604---mowuzududigadur.pdfIn PDF document text
    • https://polaria.cz/images/file/92124707233.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/89224129157.pdfIn PDF document text
    • http://3m18.com/images/editor/files/muvaburupemuzo.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/93908764589.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/jadibulij.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/rqtevn2s89vq7n408npehfvvn1/nefetul.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/fikekijikuturaxi.pdfIn PDF document text
    • http://djapm.com/userfiles/file/soxuvegapuneturikavag.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/4187285421.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/welemenusazukunarilokedu.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/72319588937.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/losodobame.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090616253073499.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/tupipazatemisedevom.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/70925991128.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/lubesig.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/fisam.pdfIn PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/botozibaferomezi.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_off0000adef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEF 10880 bytes
SHA-256: a3e21ab6a0d9b22070b765ac09bb29752f01352c68d45c296d9093815d186d96
font_01_sfnt_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 13964 bytes
SHA-256: 8e1a98fe0a7515242f722f1d15872b8f8ceaed3ede676ffbd5e581c2b4ce0a3e
font_02_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1