Malicious PDF — malware analysis report

Static analysis result for SHA-256 a924e7a554e69530…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 13:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9c7442e129e996d833c821c98b5ee13 SHA-1: 2d9db42789884abe9889f10f515a73a48369aca1 SHA-256: a924e7a554e69530a2a48c2c7fb0bad95d721910cccae160edf17b8910f6831e
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. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to distribute malware. The document body is heavily obfuscated, but the presence of many links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://francois-daulte.com/ckfinder/userfiles/files/33545143697.pdf In PDF document text
    • http://assotechne.eu/userfiles/files/lakuvemuvemabowifud.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/61117376327.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/20337543264.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/19669472008.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/18034d101d4a40dd7f078126288d5863/zajinizebibuvuzunit.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/68250691907.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/repokujavalalotomivukat.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/18687480874.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/87132955564.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/doginutap.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/42907229800.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kelidozilowogurilokizi.pdfIn PDF document text
    • http://crm333.com/documentos/file/vimimemibamomub.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/nunejir.pdfIn PDF document text
    • http://polkovnik.su/upload/file/81889967414.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/julinekupimob.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/wagabojiv.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/97065952016.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5e9cff9c849a7e09403110f1e550f4fa/segik.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/41822951659.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/7753886255.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/maxatixixotewuleri.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/fidonagesevisoweketewabam.pdfIn PDF document text
    • http://abnicum.com/files/file/83596976381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fb+liker+2021PDF 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_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 9952 bytes
SHA-256: 2f9a40358f35d49d0aab4dd69bd98269dcc1a6eda0559a8fe4d1920f782da06d
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 18356 bytes
SHA-256: 938fccfd57defe8f96cd48b92e293444cff5694c9bfd586386c17b57309abd5c

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