Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6315706d285f28…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 00:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad48cd6f6ccca33d989ca389cb306bd2 SHA-1: 113559e8567f7752993511478b920152529ad438 SHA-256: ab6315706d285f28c6448554ceacc8e7375716fa000141dd8a90a5b023b3b2b5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The presence of a link farm with numerous distinct hosts and the 'urgency lure' heuristic suggest a phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://enotecagaribaldi.it/userfiles/files/sofavonifafuzafotubugim.pdf In PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210919_6429500B38EC1265.pdfIn PDF document text
    • https://buka.ru/sadm_files/4374978775.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/13663829417.pdfIn PDF document text
    • http://aven.su/userfiles/file/6990970782.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/ridunak.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/somafepavuloxurulabeko.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/dejadixazemapaxi.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/rikilinaruzomutas.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/rodokafejojibajo.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/68138813760.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161349450d7413---rofotonirasugole.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/47908944488.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/zegopuledimod.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/fiwadoruwijepapatetu.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/46298462917.pdfIn PDF document text
    • http://otczenacts.com/media/files/43286516498.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/89236426065.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/8392755154.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/94047503266.pdfIn PDF document text
    • http://www.celso.org/download/53407074119.pdfIn PDF document text
    • https://ebooksweb.net/files/file/suzudebomimidonibekalowu.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109152034283220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=amazon+prime+mod+apk+for+iosPDF 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_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 18192 bytes
SHA-256: 24c40c8ba3fef034e3033fa6982c88c54ad7b6706b83d5e7046b83afa52f070d
font_01_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 10648 bytes
SHA-256: dc6327f97d16a5381cbcc27c4142d92ac833b591817613cd92dab74d6c07dbed
font_02_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1