Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9e0e44697446de…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 17:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e977994c7a7a29fb744084ed767d2f0c SHA-1: 560b5030b80d41b3785ef35e883bc2e9cd2a8cb8 SHA-256: ae9e0e44697446deb3bf7ac569a14358227d4a26070574aac3f4dfee870fb963
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to download and execute further malicious content. The 'Browser extension / update installation lure' heuristic strongly suggests a social engineering attempt to trick the user into compromising their system. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=download+latest+version+of+cash+app PDF link annotation
    • http://chelseafoodmart.com/uploads/files/rafotilijenudewila.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/8450364304.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/90890023175.pdfIn PDF document text
    • https://inarsindbari.org/uploads/mobezalufiwurivedadem.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/72955436645.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/98194538142.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/vubotuje.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/50940458414.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/pofoleju.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/7006717267.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210912_04E8782695A8363A.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/27477950253.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/99092616986.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/kegazikofozudimitur.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/37653378682.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/8931071722.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a8e4575cb---zakitedibujet.pdfIn PDF document text
    • http://odumakus.com/uploads/files/ropenuta.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210914_0E71CFF971FF878F.pdfIn PDF document text
    • http://szjg.hu/images/file/vaxalujunaxe.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/sizixuvabojisubidoxalomaw.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/nagipotuvepoxinal.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/degib.pdfIn PDF document text
    • http://xsteelstock.com/d/files/pikejasuwu.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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 10868 bytes
SHA-256: a787b15622db0d01cf89b04378a8a3805697684c10f8c9e3daccfa4d6cb90133
font_01_sfnt_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 18012 bytes
SHA-256: 7d6d958987e7c77f3ecffc2a6b4a0c8c5874b4ea8f0f4585c612316f1842265d
font_02_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1