Malicious PDF — malware analysis report

Static analysis result for SHA-256 240b6d0c7f9cd8d5…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 08:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 301c8ba36b314eb3bbe22444e4adedc7 SHA-1: cd31c02571139a6780ce8b4caef79dc40adeb9ea SHA-256: 240b6d0c7f9cd8d5be6ce06d8cd9ec99b9ee3a697592e2987c95056d74bba757
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests it may be used to exploit PDF vulnerabilities or redirect the user. The overall structure and numerous links are characteristic of a phishing or malware distribution campaign, often initiated via spearphishing attachments (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aiswaryamatrimonials.com/fck_uploads/file/31013487993.pdf
    • https://millersexpress.com/userfiles/file/85838313715.pdf
    • https://livbiopharma.com/userfiles/file/47570306927.pdf
    • https://feldmann.pl/userfiles/file/bajopomawip.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/xenef.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/nojamekonisewidaj.pdf
    • http://sapientgenerator.ru/files/userfiles/files/65287165269.pdf
    • http://saigonradio.com/userfiles/file/gibinodu.pdf
    • https://unicorn.mn/js/ckfinder/userfiles/files/zegalawobalevok.pdf
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/zurifodelobavotidoxajifu.pdf
    • https://ww150003.linebot.net/upfile/files/20210909191110.pdf
    • https://rubenoferro.com/userfiles/file/nasapapobewifukenunoxibi.pdf
    • http://avvocato-callegaro.it/public/file/tujotajevitopeja.pdf
    • http://modnyi-buket.ru/uploads/files/79789890831.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abcb9d7d96---61294441240.pdf
    • http://balletpanov.com/uploads/files/56312878737.pdf
    • https://medsplus.us/admin/images/file/92786293413.pdf
    • http://houtackers.nl/userfiles/file/75187270594.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/makopafibaselux.pdf
    • http://unicaconsultoriarh.com/images/files/butizuxegaxatixem.pdf
    • http://nhadatv.com/webroot/img/files/29005869543.pdf
    • http://celesteandtorsten.wedding/images/file/meneka.pdf
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/94315207745.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/88900546370.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161327b868ea05---kigerum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=eye+of+the+beholder+gba
    • 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_off0000e041.bin
74a8c0651486ad65ac7a2f1083142373a818909d03a81e0dd8f38f541dd0cd4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 20304 bytes
font_01_sfnt_off000115d8.bin
bb33c974800424fd5ea61eeec618728085815e080271f4b475e3062b277f5eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 10504 bytes
font_02_sfnt_off00012dab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAB 16792 bytes

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