Malicious PDF — malware analysis report

Static analysis result for SHA-256 5083b01ace0b71c3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 14:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc220c19276f0bfa7545197c8146fcb4 SHA-1: 694e111d217591f468c7b397bc5d7180d82383d3 SHA-256: 5083b01ace0b71c3ba0a1d5b9064ac3fee8d2301bcd8a720a22a5c48b1fb393a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=find+trig+function+from+graph+calculator PDF link annotation
    • https://faktxeber.com/resimler/files/luvusolizagenesevogo.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/xaratatutupozepalijal.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/rugijirewe.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/bukivoxudapowutopekirori.pdfIn PDF document text
    • http://strandedtattoo.net/file/17440920452.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161352ae3e9fa8---muxugusokowepa.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/85450622672.pdfIn PDF document text
    • http://espicycooking.com/files/file///94251124570.pdfIn PDF document text
    • https://congchung7.com/upload/file/jekavumewutujanabi.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/48567541598.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/34833748945.pdfIn PDF document text
    • http://azizolace.cz/images/file/merediropenopuvimonufogir.pdfIn PDF document text
    • https://olterus.org/contents/files/kujivudogebutomitimoxuwod.pdfIn PDF document text
    • http://findusafranchise.com/files/files/velasowusajijolapalajus.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/24860033883.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/puzaroxelafekofug.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090615103473499.pdfIn PDF document text
    • http://oodow.cn/upload/file/210904191109286999cvfws8urd23w.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/87014394113.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16137629fadff9---kumilibofisikexafekunuf.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/punugogive.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/68196579265.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090815031170554.pdfIn PDF document text
    • https://synersys.fr/contenu/file/19631067004.pdfIn PDF document text
    • http://kisito.com/userfiles/file/donekijojefewajutefoko.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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 17384 bytes
SHA-256: 3c8345a1891bd4bb774531e0b3c4d201b7804d5886880cf5eca1e8caa8acc618
font_01_sfnt_off00010a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 10844 bytes
SHA-256: 910cf7078685e8300dacd4387b84c746fc8e1103801530e8e0692c986c4f7033

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