Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1616e8d58a82339…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 00:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1224fd1d8742f7b2356727da4bdf53f5 SHA-1: 986cebf744e8660de300cccfa9de118acfedb4e5 SHA-256: f1616e8d58a8233963a2addd33532e6eec3d3443b61877a1c96de2502afe7ff4
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 potentially malicious domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, and the ML classifier strongly flagged the PDF as malicious. The embedded JavaScript likely facilitates the redirection to these external sites, which are probably designed to host phishing content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://lrsinc.co/userfiles/file/lukovutemovapujoxumivozeb.pdf In PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rofelenejikurovokure.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/48604536942.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/74422721053.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/fudonebe.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/99075641541.pdfIn PDF document text
    • https://majubesar.net/contents/files/betaxedikerajotife.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/37815705864.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/38290917066.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/1017539634.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/19754292209.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/70280420849.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/koratesadodane.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/kipebabesixonema.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/fevil.pdfIn PDF document text
    • https://mahae.hu/files/files/gijazadu.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wexilidisuxetaxekogikod.pdfIn PDF document text
    • http://myesen.life/userfiles/file/91578455333.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f16b7c430---58322779590.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/68674840737.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/nuxuw.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/83183522943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+app+to+watch+hollywood+moviesPDF 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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 10916 bytes
SHA-256: 7f716e20dd2cb317172d9f9e19392313adbdd0f78a4ed2ae60dd25a2c5ef9cf0
font_02_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 17856 bytes
SHA-256: 007a611be6d0e2151b7df7241beb8b0f0a60f162d791d0506418e33573c92a79

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