Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2de2fc79d6cb5a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 14:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7fbd697bebdee419d559b68b755e477 SHA-1: 3c1026341139fb1d1196d67c23e3dd18b8bf1773 SHA-256: 0a2de2fc79d6cb5aa2dd1d31ead9b949af4874daa490fa544cd4dd23e35d75f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, and the presence of numerous external URIs suggests an attempt to direct users to a network of sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://masukpt2.com/contents/files/54373920666.pdf In PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0adf2c8ebcd870128c5f271fd6d572c/20405659470.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/34951097001.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/15222441130.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/52140550934.pdfIn PDF document text
    • https://fond.ru/userfiles/file/37390906582.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/nisikikekasonapizezokavob.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/lowojolawixiliwenu.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/20138994129.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/69248406089.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/85889127252.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/digesuvetin.pdfIn PDF document text
    • http://e-hematologica.com/users/file/34764855267.pdfIn PDF document text
    • http://taxfreepoint.com/file/47056589169.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/99867466902.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/78295008816.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/41292796286.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/75258254706.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/dororifekixipesobifajemud.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/28603023497.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/posedidipagisosofoxi.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/jopakatogakufow.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/17856692747.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06828dced---13511669585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=things+name+start+with+aPDF 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_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 10440 bytes
SHA-256: 2a17e6ae0f347077355789be07050f97a88e8fbf04e031f711d8dd40cfe67577
font_02_sfnt_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 17964 bytes
SHA-256: 29eadcc8ff030e4cc00d9fd1162b0e4acd8abbaf46219768cfb8c4aefe64fa39