Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77b452c70fbb562…

MALICIOUS

PDF

86.7 KB Created: 2021-09-09 09:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 76e93bcaaccb264af50973a4b91a8581 SHA-1: e8bda1f6ea40eab4ef2f8dc85ac58e2d27af2c8b SHA-256: c77b452c70fbb5628f8109e45bd6c5943d774c18d45e0e95aafe9f96451607ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=oximeter+app+for+android+phone PDF link annotation
    • https://reaga.net/js/ckfinder/userfiles/files/51625129268.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090216523869.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/folis.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/xarizoz.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210908_4BD656C069F827FB.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613965885d5eb---64441441692.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/35306228140.pdfIn PDF document text
    • http://ubest.ru/images/file/gaxeretamabik.pdfIn PDF document text
    • http://livestocktool.com/d/files/wudenukesup.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210905055520298257b7zd2.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/31640474731.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/56710440648.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/megagemufakeroxaro.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/dixazejuwipopamosorefi.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/64210802680.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/zegaviju.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/zepibakonafopafuwun.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/pafaja.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4b41c252---lewoxevoxerejovaduzulali.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/71259953046.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/lewowegeru.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210901_174228.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 17876 bytes
SHA-256: 29db511856f50da9c8356c32c5a873b35a68058004b25ae8578ab5734a4719f3
font_01_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 10676 bytes
SHA-256: 976ff508d4a3bbe4c8562795406d53e918022885abe747c578ead5ea8e15d67c
font_02_sfnt_off0001354c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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