Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a2044d01f7ccac…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 07:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46289e50639641d99de2912d7ad28d5d SHA-1: aa928c15f3c25883fe88841f3619a06e8251dcfd SHA-256: 53a2044d01f7ccac1da31a3c077714c842d3d8d80c314ed4a478b06d3908c4e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using many distinct hosts. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=dls+2019+download+app
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/kadas.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/rajudamelaru.pdf
    • https://forumsevens.com/images/file/26011412124.pdf
    • https://thucphamtruongxanh.com/Upload/files/dulafaminujunita.pdf
    • http://isspskola.lv/userfiles/files/6996547536.pdf
    • https://promtour-rural.ro/userfiles/file/2141350210.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/43761992201.pdf
    • https://projectmine.hu/ckfinder/userfiles/files/deziverenogexivoteteliza.pdf
    • https://tainandentist.com/uploads/files/202109100349257273.pdf
    • https://dongphuchuytai.com/upload/files/gubujegagowuzejovo.pdf
    • http://gojjang.com/uploads/files/mujujapizo.pdf
    • http://cuoredicane.it/userfiles/files/12147049147.pdf
    • http://dieta-plus.pl/userfiles/file/detazulebibu.pdf
    • https://smg.bid/ckfinder_userfiles/files/24409016167.pdf
    • https://spandoekland.nl/userfiles/file/fabegujifo.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2687893e---34076182741.pdf
    • http://studioguagnoni.it/userfiles/files/pipotaninirapumetefixenug.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e8928deac300ee7bdaf1dc70661d887e/36451944671.pdf
    • https://leresto-niort.fr/images/userfiles/files/wituken.pdf
    • http://at2apigroup3.com/contents/files/vawinotewuxo.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/59169983132.pdf
    • https://limadelimon.com/images/file/funibe.pdf
    • http://freewest.at/53233805770.pdf
    • https://mldom.xyz/web/img/podborky/files/xumenubowejifijined.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_off0000d322.bin
db29dabd6e4d3d5488de46fdb5f69ed0905fc5b5eb4452d0fffe211c3271fb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 18180 bytes
font_01_sfnt_off0001025e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 16792 bytes
font_02_sfnt_off00011a75.bin
f946c29059a38e4e8fccd5f0d281840077ec1e952f44a6a2113c46b76224f358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 10512 bytes

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