Malicious PDF — malware analysis report

Static analysis result for SHA-256 a524542fc6075b8b…

MALICIOUS

PDF

90.3 KB Created: 2021-09-22 22:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1a64d25ad814c1e4343a1be47526e302 SHA-1: 4017e9c00cd8c7657d625c46f07d6751e48ac7b0 SHA-256: a524542fc6075b8ba29812a946c9c63bd3bc048643a2005db3389e4cbad0bb87
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is often used to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://queure.ru/uplcv?utm_term=downloading+music+to+phone PDF link annotation
    • http://wwstationery.com/files/file/kitupagivapaj.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/83533082524.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/ribaxorazu.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/51343474392.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/gofosumokuzadikiretirenov.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/16035858555.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/50814885998.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb6c6e381---64921273374.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/regaxafumadefokejeza.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/jelaregawopaxapelaludeti.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090522135847.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210905093049.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/mofepanojugexefizuwowozej.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/91511493292.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/mupotafuruxepavijov.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/19587392768.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/xunanorigavonitawosomadu.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/wivowaditilejope.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/44159645603.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/sakopamumipu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a21ab0610---2012430588.pdfIn PDF document text
    • http://platcometals.com/images/file/61665301185.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/26983307132.pdfIn PDF document text
    • http://voijin.com/userfiles/files/24215886541.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421aabb81ef---bojitanewufevus.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/15453020296.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 11048 bytes
SHA-256: c76e5e693a17e11ed722ff3e2ddf52e033845cc5d01a0d6954099f87fd7db7b7
font_02_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 16708 bytes
SHA-256: 3d7b5fc8e39e09eaa1065697c26bfe9a65bb28784da99ccd5559f2f0e14e1734
font_03_sfnt_off00013b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B18 19596 bytes
SHA-256: 35afc98e9f42549f499020369d140a10a322b5513b080d791760c945a6656907