Malicious PDF — malware analysis report

Static analysis result for SHA-256 779d8c306927aae1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 15:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5127fde43a29698db0be0cdd4dd0d33c SHA-1: 6bc02a74f127a05a1380b8cbdcc0f27f760b646e SHA-256: 779d8c306927aae12a8d6480db3b9eb3854e79439ef27ad1c7e7ef611c391dfc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the PDF is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=sword+art+online+characters+season+1 PDF link annotation
    • https://dascalita.ro/app/webroot/files/userfiles/files/3563764611.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/91298927756.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/kolesonaxazikibowizafis.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/fubijumukupajome.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/22661014083.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210909070204.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61378144A9487.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/buwigavudu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631161354.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/wowujodiz.pdfIn PDF document text
    • https://thietbigas.net/media/files/73692671785.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/fimagaveteme.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/jidaseluragasik.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/73395034301.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/satejavejuzusinaduwix.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161386d88ecaeb---gigonijev.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/sezerudexukokeb.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/15617716367.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/42180612040.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/41662979766.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcdb799600---vugetizuvonow.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/16243000656.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/97915574708.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_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 21068 bytes
SHA-256: c10735dbe0336b7344b132f18d11ecb3efb4340871953c0b78ce14d32bfd568c
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 10680 bytes
SHA-256: 9a3cedc55c8178569e954e79565aa6c811b5e3a986c363cee312ca81526fa7b0

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