Malicious PDF — malware analysis report

Static analysis result for SHA-256 267f8bb6472c6aaf…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 00:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fb35c7501315fce02ac310489debf4f SHA-1: d7e49ec7b1aadda76c2c7a0fe8f6d38877de1ece SHA-256: 267f8bb6472c6aafce48e5c5b280825b9e48770906e26e0e297da122acc3a09e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable hosting, indicating a link farm or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to host many links. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's used as a lure to direct users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://vouchertiket.com/airplane/ckeditor/uploads/files/xajavegopu.pdf In PDF document text
    • http://kystar.net/filespath/files/20210904230233.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/xulufezopega.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/4391936099.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/12701383863.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sodozipape.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/sejolejiregifava.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/jazeralebatimanapowepinen.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/dujobivedewonuf.pdfIn PDF document text
    • http://888chji.com/userfiles/files/zufunadeduviv.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/94480040204.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/53278865511.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/virap.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/detapudomalaviv.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/batir.pdfIn PDF document text
    • https://clickbox.ro/images/file/temajedodamozizobetirit.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/fenutot.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/wemawinexilovosiroperi.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/wamijeluwikejidutozed.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/suwimilozavex.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/13381998624.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/10102701956.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2f8c095a5de08f0015995465a1d529b1/57329823901.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/rurenadagizeli.pdfIn PDF document text
    • https://noventa.cz/media/files/file/ralapesinitagukasug.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/59452226264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=google+play+store+not+working+on+my+android+phonePDF 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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 17920 bytes
SHA-256: 18e8bb2201a40831b8cc21e2b518c30c31b53ee5c7357cc5726d68e5b6bb46e9
font_02_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 11172 bytes
SHA-256: 39c15ab6d315bcca7b0b0feadb5e4b41350342d98940aad60c95e96c93b2ff3a