Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e49152235193bc…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 10:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 304d54b1d0428d1298bfb9d538749c19 SHA-1: 2495377360ea78391a4bb2d02034d2fe0ceae746 SHA-256: a4e49152235193bc8532b82a553f61b39ec0315a68da9a34375e476524ec0ca9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded URIs are consistent with techniques used to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=index+of+breaking+bad+season+5 PDF link annotation
    • http://7m-shop.com/userfiles/file/12545795269.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/86641388084.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/tanobifoguteripa.pdfIn PDF document text
    • http://pi-consulting.ch/download/39680186316.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613301936958d.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/sapaluviposu.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/65371336687.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/54046285045.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/27535229673.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/ferebaduwi.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/15552310845.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/81598746524.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/sozositiperer.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/62597154924.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/80268104194.pdfIn PDF document text
    • http://wamer.org/userfiles/file/9466584167.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/zimimejevupedexosubub.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/8257669420.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/53667134452.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614685e84369b---wivuvisunoxofofusobevo.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/46372223167.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_off0000c678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC678 10804 bytes
SHA-256: 38cb1f5c3d25aa7fa3f270ab35af33b684abaa50d286aa9e852e5b52567e1047
font_01_sfnt_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 21140 bytes
SHA-256: f6a3b7e1cfeb794b2443f8806b707bf9426d36dae0a58b9dfdd63df72d671711
font_02_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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