Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fb4269d1016d5a…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 03:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 223fc62914879478d9c05487a33ee885 SHA-1: ba50e5b46f454c99ab73c9ee34f07544878dfced SHA-256: a9fb4269d1016d5af1d9eb154dddb918c896a079e4fe9322c2be08b838d009d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ClamAV detection. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=how+to+train+your+dragon+season+3
    • http://studiotecnicolari.it/userfiles/files/99126798462.pdf
    • http://werder-ritter.de/UserFiles/File/5820182579.pdf
    • http://elhammagazine.com/ckfinder/userfiles/files/58667268444.pdf
    • http://cafemsoffice.com/userfiles/files/ribetogasigawiz.pdf
    • http://captainkillmite.com/uploads/files/202109020814251960.pdf
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/97973024462.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/relopo.pdf
    • https://rosettes.it/userfiles/file/65601619545.pdf
    • https://ww150002.linebot.net/upfile/files/20210903183445.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210907_040629.pdf
    • https://chowdhurytourism.com/ckfinder/userfiles/files/86963667002.pdf
    • http://zhongguohuachun.com/d/files/jurore.pdf
    • http://abwmechanicsville.com/uploads/files/moluze.pdf
    • https://hnhaa.com/userfiles/tnejp/files/mofinivakaguzosono.pdf
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/romuleduwaburuzovak.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/945e78ac2345c297a71e38ebc9e2f1b5/79236636221.pdf
    • https://cytokin.ca/upload/editor/file/nisigubozojumoxawi.pdf
    • http://notariocprietoa.com/notaria/documentos/files/66354211777.pdf
    • http://kondicionery-elektrostal.ru/upload_picture/file/45136417323.pdf
    • http://joyandwowbook.com/upload/file/sojodilewopekakafo.pdf
    • https://ritascreation.com/userfiles/file/58262895599.pdf
    • http://gjbbang.com/userData/board/file/28418872893.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aecd34ffc3---72293763059.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/fumojonanizowakimiwe.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_off0000ee7e.bin
18b68269ce36af799b85bee3b438d2aae6eca880d8ab879e78e4c032b636b0fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 17916 bytes
font_01_sfnt_off00011cd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 16792 bytes
font_02_sfnt_off000134e7.bin
fc847fea8a450d8a1d11646ba2f899142c2f340118e4408b558527310030a2ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E7 10840 bytes

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