Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e0b1027ca44777…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 08:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 765780f9800a5f4c5dca47cc40f363e3 SHA-1: 3051ef052a72f10db9e7d1257f264d89a456d22c SHA-256: f2e0b1027ca44777ef35a9aae4e35a584367eb688840a312a8712704c0ac8fa6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://eqonetech.com/upload/userfiles/files/bobosilenekexoxitavexenak.pdf
    • http://nagakuratrading.com/js/upload/files/gefavoleme.pdf
    • http://www.lircai.com/web/inline/file/kawadinisef.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420f3ced831---65349660344.pdf
    • http://www.gdchgs.com/admin/img/files/pusiwi.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f879699e9b---zimifazodopukovaxo.pdf
    • https://towa-aaa.jp/userfiles/file/5353708049.pdf
    • http://divyabodhanam.org/userfiles/file/43071917371.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091485452_1008089784.pdf
    • https://pharmnet.cz/ckfiles/files/files/pulolasuf.pdf
    • http://newmob.it/userfiles/files/mejozinowapudaja.pdf
    • http://quocteanviet.com/img-chamthi/files/4900904689.pdf
    • https://m-astar.com/UserFiles/files/76333516826.pdf
    • http://freetourscadiz.com/ckfinder/userfiles/files/sotede.pdf
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xakodij.pdf
    • http://balletpanov.com/uploads/files/39776442542.pdf
    • https://snapstudios.ca/userfiles/file/nizukonebujinurikuniji.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/wapedajowaj.pdf
    • http://tuclubcr.com/campannas/file/loledakupagixarivafiwuv.pdf
    • http://ttccid.com/userfiles/files/93322772732.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cracking+toefl+ibt+2019+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c274.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC274 16792 bytes
font_01_sfnt_off0000da8b.bin
0f1b539eb4a2f77bb05ddcdae9dfce47549693d0489c92af2164db3e53a4bec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 11352 bytes
font_02_sfnt_off0000f50a.bin
b099a197bb8e577ea00e6e5fd1bd9bfecb4956b8f2a5e6898391d7d9380fe682		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 18096 bytes
font_03_sfnt_off0001241d.bin
645820c595d4038498db028c8b5d80835908cfe6b43d33359db03e6d05944cee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 16836 bytes

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