Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b4543bfae78f7e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 19:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 839fc5c5e416c717aac45ac87e64da95 SHA-1: 0679feea12dd650bac44de6bd8e173514f5f1fa0 SHA-256: 70b4543bfae78f7e8b197b0bd12aa281ab71ed4b86e77d715e99c5d2ac3e1ff5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or malware delivery, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent.

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://pistant.ru/uplcv?utm_term=where+can+i+watch+the+croods+2 PDF link annotation
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161309d8f7c0ab---90873006857.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/vanotixaxakuzebi.pdfIn PDF document text
    • https://intersat.lv/files/file/kegikovizinux.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/46224284871.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/naguzedolazowajesuzijew.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/60652741515.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/gabeduguf.pdfIn PDF document text
    • http://benetalent.com/upload/files/45316217470.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/20416132952.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210914165332858312lwce2.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/12157240143.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/kiguxubifebesuzorenewivop.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/12023597520.pdfIn PDF document text
    • https://synersys.fr/contenu/file/79586139885.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/gigurobofiterone.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wajejurigoxam.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/zemopipekinatoxuleb.pdfIn PDF document text
    • https://novsport.com/content/File/jorevudofel.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/giguviza.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/28443105549.pdfIn PDF document text
    • http://indemo.pl/Image/files/xitaketubenuwarorixus.pdfIn PDF document text
    • http://builderall.info/userfiles/file/romuxaweluxegoretu.pdfIn PDF document text
    • http://jarosi.hu/files/file/debafu.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/36753744827.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_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 10620 bytes
SHA-256: 529536c00a86bcb5fe300809cc81f4018cb49fd0d813705076327ea00ed269ac
font_02_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 17792 bytes
SHA-256: 0ff585e96c53f1ba1c2751791d8b90f6a5b6c980e395507c0dc3374cf10982d0

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