Malicious PDF — malware analysis report

Static analysis result for SHA-256 394fae30a8e4a43b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 06:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5794a32a7c502c0b2946c62c0a3e0ed1 SHA-1: 5404cfb0052e0c66bee21281168e66328074d5a8 SHA-256: 394fae30a8e4a43b172f63cc61b1fa47217a0ccb246c7e9f50ca03b765052866
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for distributing links across disposable hosting, reinforcing the malicious intent. While no scripts were directly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=bluetooth+text+messaging+android PDF link annotation
    • http://magnumprint.ru/upload/files/fegujuserukapinaf.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/saregaki.pdfIn PDF document text
    • http://hmed.vn/upload/files/firexibisukanuboxeronup.pdfIn PDF document text
    • http://infunplastic.com/d/files/luruvu.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/55662565136.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/35921135636.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/66951404073.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/gozamiweput.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/72532613885.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/1744583092.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/37101902349.pdfIn PDF document text
    • https://zzhqhi.com/d/files/ginogiriwa.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/47593050211.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/89058588203.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/54995276053.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/wabuj.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/79712899688.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/76969158535.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/77564082905.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/movawonol.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/11489492845.pdfIn PDF document text
    • http://www.heksan.com.pl/file/dodowuvale.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/vexaw.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/33136153800.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_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 10952 bytes
SHA-256: 252e8d2a113d9e3666b505567c66c71db0aa6f1f0d4ff495369aba5220286451
font_02_sfnt_off0001060a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 18180 bytes
SHA-256: 4988d7b47d831e809fef681c31ec698c62e504a23b52821eded906826f3cf730

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