Malicious PDF — malware analysis report

Static analysis result for SHA-256 094c849224bac76f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 04:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a8539d0e9bc92dbc725d6c4b26be3ad5 SHA-1: 8808ccb62068283e81dfeef340b3f6c40de76c25 SHA-256: 094c849224bac76fb5f36459ca25ed57261b10c848a7db0ff783e0ec1307ebe5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to algorithmically generated URLs hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.pessin-location.fr/ckfinder/userfiles/files/popujon.pdf In PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/44233922202.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/mirabufewejenu.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/xakegijogedogiva.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/55623773635.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/dubelezudakexupu.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/15805175007.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/vesemexogelibiboxa.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/metivifomidumukunu.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/88445490954.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/luvexunawoxubumobis.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/gigilejidigufo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c546d450f1---2662744384.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/zuxuvipusigolilomo.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/65136676798.pdfIn PDF document text
    • http://adice-area.com/pictures/files/97281138455.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/livinopo.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/65231807955.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/viwodud.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/wuvom.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/fazeduze.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/26081590600.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/zuwamurazut.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/72771042079.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5pkmpmkgbd2f2lqvrrvd7hm8b/difizomani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=thinkdiag+mini+apkPDF 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_off0000c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E8 10232 bytes
SHA-256: d1a7444e09a1e33dd237b2c3e0937ff93c6ec3b055adac31e96e91a647b68a0d
font_01_sfnt_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 16880 bytes
SHA-256: 6b35e89a154b0ccfe3ac215c2f1de884bf23abb0ff5513419ef722e4fe7f44e6
font_02_sfnt_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1