Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe0ce789f1be823…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 17:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17e456e67b1345ab9ab65308e2ee6c56 SHA-1: 86610bd1b8349f1c499c1cd83e4b286e98445d2b SHA-256: efe0ce789f1be8231bb4d8c79a4538fd1a475418bb6db360263f49f277947479
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The presence of these URLs suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=watch+the+fight+tonight+for+free+online PDF link annotation
    • http://astorandblack.net/emailer/userfiles/file/25666205183.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/36030146702.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/33210542866.pdfIn PDF document text
    • http://oodow.cn/upload/file/210908013540076777nb2t6fslvyxw.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/74376585051.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/71351026337.pdfIn PDF document text
    • https://cargotavio.ru/files/file/zaroniwoxefosubozev.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/9222093692.pdfIn PDF document text
    • http://teakdeck.pl/files/file/80121880094.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613969e77597a---rixidowomufes.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/selolojuvilaxiwobuwiwupo.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/bedamozuzukalojigagopok.pdfIn PDF document text
    • http://rafaelokazakov.com/file/peguwokexipisadujoluz.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/17608616677.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/fuwed.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/66001109252.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/82595350568.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/41747215573.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/kuluwuwilirisejom.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/15215321616.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/7850338536.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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 10440 bytes
SHA-256: 7d7ab73798602f51bfea39a59c410d57d5d0852871be856f6ebc916e8c795348
font_02_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 19040 bytes
SHA-256: b444c8bed3dbb21035f515192de78d9ebbad17f10e24e4f5057db536b4cbb3eb

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