Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a395d915a7973a8…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 20:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eeacd3dcd34c516b9334a7cc87d3f0ab SHA-1: 793551f8f2ec235a512ea1c1af8a73148b2bf4d2 SHA-256: 8a395d915a7973a877bdfe93e72441fe29b85ded9ffb2b2e546562718a8c3aa3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://instant-image.net/UserFiles/Site/File/vurokise.pdf In PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/89042261548.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/88038845122.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/neduwujikulo.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/raxisuk.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/89757301782.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/zisuwedorikekovokemovada.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/31327158926.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/tebekuvorokukefevi.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/56333689503.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/burinavamij.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/gotolusanuf.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/mopowikupekaweg.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/zetadonifesuzomigel.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/74783274301.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/298caaa1e9d211b673fcd8b2a6d7de2b/kizodoxikubotu.pdfIn PDF document text
    • https://datenglagi.com/contents/files/xugogiruxuvaro.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/lanekovoset.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/zijenekasuriwajipaliwuk.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/90917393644.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f630f22833---riterudukonivepafuxawo.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/jugabeso.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/nugaxufuweja.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/42373110284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=old+movie+downloadingPDF link annotation
    • 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_off0000d20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20D 17612 bytes
SHA-256: b72fa00ce982253f6964bcbcd5449c6693c2fa82332372734be94fff5fd993c1
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10404 bytes
SHA-256: d23d400a10d8f19c465f6880f2b313341a91a4b0a8d0adf56062a1d13bdd1322
font_02_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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