Malicious PDF — malware analysis report

Static analysis result for SHA-256 b089bc1e74ede8d2…

MALICIOUS

PDF

69.7 KB Created: 2021-09-22 11:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7d278155343ebba2a26a6c6998e2e7c SHA-1: ea338a8091a5bd6f8fb4ee1dea8eae749982c295 SHA-256: b089bc1e74ede8d2a204a1a648f95fd80fdcffd326dfe7390aacd6e1788e0c2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hatdesechia.com/storage/ckfinder/files/32130665734.pdf In PDF document text
    • https://gsm.company/ckfinder/userfiles/files/12699009694.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/gabofenakunasakug.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vewavew.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/tanijedowuxewiri.pdfIn PDF document text
    • http://glassick.com/userfiles/file/59863102829.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/sasifafaduxaw.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109150846503823.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/13843445063.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/34662544296.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/15146609647.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/9720501230.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/43294727997.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/43622351289.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/51778432312.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/daridusizagitib.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/pegude.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c95400b19---89923563796.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/xemuvedov.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/buxekixavonaw.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/majilomevilusoxer.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/gijumapewulopukafisepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ludo+atm+apkPDF 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_off0000b47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47F 10060 bytes
SHA-256: 44f00575f2f413f0f37644d58d1a20aa805cfbcb1d56b0d04f4a1b821aebf55c
font_01_sfnt_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 15164 bytes
SHA-256: af81d248ccd32f1d2b36d34da6b2c17a6bf5e2700f5d0eddd8bba17cba6c8ffa
font_02_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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