Malicious PDF — malware analysis report

Static analysis result for SHA-256 d916763b4377ce91…

MALICIOUS

PDF

90.7 KB Created: 2021-10-06 13:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6fd06332c52b947f21d84513618e30ac SHA-1: 3e5d9cf7fbef1190c530750b2b3af979593a1a91 SHA-256: d916763b4377ce915ddcc4e8f9764d405d8f6092e205925e8ddbf27b37952bfa
126 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 numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of PDF malware often involves exploiting vulnerabilities or redirecting users to malicious sites, aligning with the 'Spearphishing Attachment' and 'JavaScript' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mosvag.ru/img/lib/file/21599396849.pdf In PDF document text
    • http://zjleiou.com/images/upload/File/37617136420.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/mutowozavi.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/84416059043.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/guvizul.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/diluzarar.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210903202655.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/potidaxamedigusuze.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/mibemadanojejifilelige.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/dulosizazotomevofine.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/kazuduwukinusutadatixiru.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/40016598485.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/fegixulunoxebaviko.pdfIn PDF document text
    • http://willbramephotography.com/zubavudunipo.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/18830602400.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/49730136602.pdfIn PDF document text
    • http://bienbao.net/uploads/files/sorerinirusevo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/030560c3a06fe193bee6082c1468ce5a/jebajidutijoked.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/sofivativugiwikuw.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f01c47629f---zifob.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/bipilikol.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/figejozaves.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/desufileluromakuwobupepe.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/nuvabikoxekowijaropodis.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/40698736370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=happy+new+year+movie+download+mp4PDF 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_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 10620 bytes
SHA-256: 44d9dd33d39c7bd502b33972895b13e93a9e05d3b295bf1213a3b560f23ca850
font_01_sfnt_off00011567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11567 18508 bytes
SHA-256: 0266db7f2a45f2cff0def2da5f51bb203f8a7bd35cb936457b6cb5f08fbbc2ec
font_02_sfnt_off000144d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1