Malicious PDF — malware analysis report

Static analysis result for SHA-256 4317bfd6dc444a22…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 00:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef118bd28e496f896576c90d4c07a6bb SHA-1: 28c874998d32815dd0fc0a931b859131d5d0b965 SHA-256: 4317bfd6dc444a22573828ba02a1c11034780fc917a8367424c2dd7c4e67100b
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 trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to redirect users to a large number of distinct, potentially disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gemicilojistik.com/userfiles/upload/file/munuduvajuvekunut.pdf In PDF document text
    • http://biplano.eu/userfiles/files/50115934818.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/wigolofapigoguti.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/zazetimudogewetidop.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/18911746902.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e722db3ae1---zinemobowa.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/5145864191.pdfIn PDF document text
    • http://mfcpavpos.ru/file/90386164558.pdfIn PDF document text
    • http://sb-78.ru/files/file/tojajuwiwikem.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/75413404690.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/xoxigu.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/79957078038.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/17010902933.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/41576115275.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/vopoputekev.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210905133318.pdfIn PDF document text
    • http://canadianrockies.info/files/file/2620440113.pdfIn PDF document text
    • http://wamer.org/userfiles/file/populivawebepetigexesur.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/54907137339.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/xotutigakipisojalifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=boxing+fighting+clash+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_off0000add0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD0 16044 bytes
SHA-256: d36ed4bd37e951fed60550ec2a7b2f7d5ecad66fc425ac43470799e37bf88ea0
font_01_sfnt_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 10772 bytes
SHA-256: 149f514d0a250f88c23b0c2bd186bfa7652e3c360613a066c5b570922f091f54
font_02_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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