Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab156c6b779a192…

MALICIOUS

PDF

83.4 KB Created: 2021-10-06 23:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0606a33f828cb687347797eda4e70a38 SHA-1: 8b1784d8369d64d04351a15653dd3cd389a226d5 SHA-256: 9ab156c6b779a192543119224df531f1a095276b1ee33595ab827644cf03f1a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=constantinople+trade+routes+map PDF link annotation
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/jomujavupegenabatijoxeb.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/vukomax.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/kejunusalotaloxesoro.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/pinibitu.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/xukunagoperi.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/77448581442.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/femuwasapuwigakupojutiwut.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/retifevopab.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631522197.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/59668001051.pdfIn PDF document text
    • https://tonicsuitemusic.com/userfiles/files/86177545866.pdfIn PDF document text
    • http://budka39.ru/files/torobof.pdfIn PDF document text
    • https://pellevah.com/upload/files/83750220106.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gtofi0vjvgd88m9mq7le0upbt7/rupemakusilizof.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/34244764162.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7160e88f1355e0c2ddf5b931168a5a82/32251935023.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/407593954.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/virimufojodujuxiwinul.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/5814570472.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/70791031985.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/31231511509.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/tetadipowidoseloriwukiza.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/86381418217.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/46807766558.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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 10684 bytes
SHA-256: 8e8ddc27637c5d51922a193352f268a018eac76c1f754022bb51cf83eabaf0f0
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 18784 bytes
SHA-256: 412a8cb701a410b7d7bcb45deb2f2d62a920d11fa1f5c4984ea6425e3f44af02
font_02_sfnt_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1