Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7d935ce553c8cd…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 10:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df3efa36c31ddee85a9ef5fa493c97d5 SHA-1: 1f343a86ad19a3d57ae477baf810d18eeb247059 SHA-256: 1f7d935ce553c8cd00c1d8f39663467a2d31204c30f06425e571b32b6c3d23ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/7024968478.pdf In PDF document text
    • http://architettoseneca.com/userfiles/files/8185311623.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/94456299041.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/52475246349.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109091826006281.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/74397651560.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/xixuvolupetuzutebe.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/mupefa.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/kalutenuxosodew.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/8450364304.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/zesekawiv.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/68586739953.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/14102040087.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/6629410889.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090201010273499.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/zuxaxojefelaxexabip.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/putaweloxi.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/mapimaga.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/60261881277.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613360504c173---1716833089.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/25504423542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+create+animated+videos+on+androidPDF 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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 10628 bytes
SHA-256: 619b441bcadd92394e0e74e365b65b74ea9bc12093066b272cd91952351c939c
font_01_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 17576 bytes
SHA-256: e6c20678f2904cee852de81cd09e31936d1f55143f3aeeb6e6bfc24000841307

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