Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4af30bc897a6d3…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 21:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e07697e24f73d5a822e6e4d625526651 SHA-1: 9205084ced3caf444ded288ca9739979ce2981cd SHA-256: ba4af30bc897a6d3c52b6f9e4e7187e0f6bacfcda0d8f3217b139d79720018e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the presence of many unknown URLs points to the document's intent to redirect users to potentially harmful 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 https://pmfegypt.com/userfiles/files/timapawigapaxariranomedu.pdf In PDF document text
    • http://special-pharma.com/upload/files/19142624320.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/83156240792.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/repavesarafamolarix.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/1649449610.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/suxovewilifadujaki.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/63750727997.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/78621342331.pdfIn PDF document text
    • http://www.pvvc.cz/files/jefezo.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/dovula.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/zudojos.pdfIn PDF document text
    • http://koddous.com/userfiles/file/77051820849.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/64806580163.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/50576803821.pdfIn PDF document text
    • http://ty-int.com/files/files/sajununeruza.pdfIn PDF document text
    • http://vhshf.de/File/12014652519.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/97522543131.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/76528743121.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/komarokoxobivesik.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/delakimabubozafulob.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/2740944543.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/2683156948.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/lowemuf.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/xonoxorilopajavigedebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+send+file+in+mobile+messengerPDF 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_off0000b397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAE 10752 bytes
SHA-256: 9fb7cc18c8ef8e448fb90669d18a5da41a620216ce5d33f4013763b6b2a343c9
font_02_sfnt_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 16664 bytes
SHA-256: c0731d362c8c324af062225db52eb412af2571122d21b27803978501eef8e59b

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