Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ae71685868c849…

MALICIOUS

PDF

76.2 KB Created: 2021-09-14 14:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7ef71122ca083236fab8df0e1b21440 SHA-1: c4364057fecda4703300da1209525bc2c85195ea SHA-256: d4ae71685868c849653653f86d9bcdf3644d0eb30f398dc3547de4e00a4257d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://queure.ru/uplcv?utm_term=the+mandalorian+season+2+episode+8+123movies PDF link annotation
    • http://nikolalepojevic5.com/multimedia/file/75987084074.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/tebezupiz.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/40192336108.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/xigibikomakorugirawan.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/46894132341.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a1eecd0926db592ee0d929c112d58fdf/tubosedurigigopiw.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/femisosawogokiwasojutu.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/likuzufopakinidege.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/18173756119.pdfIn PDF document text
    • http://dges.in/userfiles/file/gexafiwemevomudirewoxovem.pdfIn PDF document text
    • https://actorconseil.com/files/file/70017574154.pdfIn PDF document text
    • http://regmac.net/userfiles/files/45702820805.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/butugedezesopodizujopo.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/83625423850.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/judekilitedunogovezag.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0dd49a069---44478764977.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109061002351375.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/bopumano.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631238536.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/92130887912.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/24333302905.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/18214170214.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_off0000c4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A0 11140 bytes
SHA-256: 25cd10070b39fa352c5d93a3879d1714449b221abc2783fc6ce4a2b08edf7e2d
font_01_sfnt_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 17588 bytes
SHA-256: d18dac10bdd5987e8a836d6c3ef2f8a957bc0145b3f3f2be98eab353d86ce591

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