Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d931a3adc124d8…

MALICIOUS

PDF

87.4 KB Created: 2021-09-13 22:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08f4c435abc4d57c0d5c2dc3eca1fc93 SHA-1: f36dff79bfc86cef4a9096a9ef82a6be1e70e73d SHA-256: 56d931a3adc124d800303d565ec0c2dab4958cb5b13bff087b52a2c1d11eae95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. ClamAV detection and ML classification strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=swear+word+beginning+with+l
    • http://gachbinhduong.com/upload/file/14494614100.pdf
    • http://dj-maily.com/uploads/pages/files/numototigafa.pdf
    • https://swapnauraan.com/ckfinder/userfiles/files/96880641376.pdf
    • http://bedrucken24.de/userfiles/file/1713201743.pdf
    • http://desiaussies.com/ckeditor/uploads/files/xivovemo.pdf
    • https://prestinireedcorp.com/userfiles/files/kirebinimaziv.pdf
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/kupeloxafewaloxuku.pdf
    • http://1-sanya.com/blog_images/blog_/file/56033351841.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0d4cce6c3525459eb41c318fa1186060/41359926141.pdf
    • https://nangluongvada.com/uploads/files/51870572477.pdf
    • http://whitedwarf.ru/public/images/ckfinder/files/tivedazowasenelomodopoxid.pdf
    • http://esejsc.com/upload/files/32779546227.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/47152293325.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9689a36de---dunamemirere.pdf
    • http://world-housing.jp/ckfinder/userfiles/files/daxosivufipefosiboxigol.pdf
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xiwamavego.pdf
    • https://redengewinnt.com/userfiles/file/lazogasonumunerepobaw.pdf
    • http://surausa.com/uploads/files/74154139652.pdf
    • http://jayeonrak.com/upfile_editor/2021/files/zibiwuv.pdf
    • http://el-master.ru/userfiles/file/2683628263.pdf
    • http://gmei.lt/ckfinder/userfiles/files/51190962039.pdf
    • https://cuisinescartier.ca/upload/editor/file/73918155074.pdf
    • http://thunderstar.cn/userfiles/file/20210907084916911307482.pdf
    • https://tyko.pl/userfiles/file/wazebade.pdf
    • http://siripanyalamphun.com/user_img/files/89650377990.pdf
    • http://jafra-com.at/userfiles/file/83558582210.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec52.bin
7eaf0619e4cb9662c7e919725e618b567deae826b719a8bf140eedbd9f921905		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 10660 bytes
font_01_sfnt_off0001047b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 16792 bytes
font_02_sfnt_off00011c8d.bin
158f8487721de5cd9b1021508b74421bbf3c133e68d08e5d612355afc46dc7e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 19940 bytes

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