Malicious PDF — malware analysis report

Static analysis result for SHA-256 54922d19f8e96df3…

MALICIOUS

PDF

68.1 KB Created: 2021-09-16 11:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 504330968664c80741e5a3261892d963 SHA-1: e3d481dea8ac69b38cf991ca5ea68d6e5f20baf7 SHA-256: 54922d19f8e96df30ea5eee8afa9ff10e25717956c52f52edcb447e6bfdadf4e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable actions, typical of a screenshot lure. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=147+female+mind+hacks+pdf PDF link annotation
    • https://agri-mal.pl/userfiles/file/gasadosuve.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/gimirigakusix.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/27628313231.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/50739705356.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/rewedisojidozi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142272705124---52918157728.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/74693848975.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/tobinutunofeminurone.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/tilebodujiropebozokixek.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/13313825548.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/nivomeb.pdfIn PDF document text
    • http://popmetre.com/news/files/9530768181.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/wiwojisewup.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f673c924---bawowogiledot.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/manabokezegemiwusefumadi.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/tidezupagewuxanuduxadibu.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/39222882790.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/luneluvajufutopatis.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/wekogakajigunuzugitufug.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/11661602254.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/bupukulerezubemukut.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_off0000af12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF12 14128 bytes
SHA-256: f8afa4671bb9c1aa4735108be2f7b6a2d0b4938d4ebc4e49747700027d599abf
font_01_sfnt_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 10744 bytes
SHA-256: 2c70e9cc5383412d242f97648fd9c296fd78094878bedf0a702fa40c54a03041
font_02_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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