Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4fe5e14d38c280…

MALICIOUS

PDF

89.8 KB Created: 2021-09-19 02:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: efc87a94233078f402cfaabb8e653099 SHA-1: 95084fba1d07ecfd43d5495a02e97f86978b3ce3 SHA-256: 8c4fe5e14d38c280f8a16176f9abf58f8ae5fb77b4db724c685e60864e97f0d8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malware or conducting phishing campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://pizzeriagiganti.ro/imagini_ws/kagevasolakekunegak.pdf In PDF document text
    • http://erfaspot.com/resimler/files/bakejakapekas.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/3878604810.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/derogaberosi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f84c4858d9---40854607707.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613316e26cc3a---vupipoxof.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/50558341975.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/menasipigarupolamama.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/44185890546.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/48135600387.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/ganugetuvibewikopazeb.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/bolaverumiridemok.pdfIn PDF document text
    • http://agavietnam.com/img/files/zokebelisaronuzegavusaz.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/47737604407.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/tokapixabizapivig.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/3030727475.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/koretizagip.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/21785058737.pdfIn PDF document text
    • http://techbis.pl/files/file/lagulanubi.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/gojira.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/furatej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=teach+yourself+catalan+pdfPDF 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_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 17436 bytes
SHA-256: 01693f33eb7cde8220116d16ada1cab154e11184670520928d806eb364e8db4c
font_01_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 10804 bytes
SHA-256: 129070a7532a103ee589a3008876ef00572a6aa1c89a7d94ab61c3b44904b4b0
font_02_sfnt_off00014238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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