Malicious PDF — malware analysis report

Static analysis result for SHA-256 4831fcf339b18d62…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 17:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee809baf9b6a0bec5556a6b6e5bfebab SHA-1: a58bbb9d13f7bd840abc736d534e520325475135 SHA-256: 4831fcf339b18d6284cdc9d74bb452d800279f377b64e077431a3b1074e94ea2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's used to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://arsvet.ru/img/upload/9915626309.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/491f09264e9143a3d2bb7ccfc720e428/gevikufexopod.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/53889555705.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///84453019531.pdfIn PDF document text
    • http://pronobile.de/catalog/file/bafaropevowebojul.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210901_2540800BA9E92B45.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/45174007498.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/lejajuropo.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/zerebexuxuboxowubugumi.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/13378631867.pdfIn PDF document text
    • http://only-svet.ru/upload/files/30145262320.pdfIn PDF document text
    • https://12shio4.com/contents/files/luxogekotezogesakitemaz.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/62324269609.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/33400364128.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/76071831444.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/soparevigapazamur.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/68537153583.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/lawop.pdfIn PDF document text
    • http://video-cycling.de/files/file/2154091230.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109061335535903.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/72588905349.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/78341043171.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109011013591631.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344de5c66a2---85756713755.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/kaliwime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=human+liver+anatomy+and+physiology+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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 11216 bytes
SHA-256: 71dd82342dcc5206dff8e8616cb4dd0bae5cf00276c043773913288f7846d077
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 16368 bytes
SHA-256: 9023988d35c444243de6948978b3d6da684a0d36f6ea0a13606a700a81bedbd5

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