Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a07da3b8c46b98…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 11:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d5181bbb0f90ef3b17e0507786b39fc SHA-1: e88f011f8b71987e7db0b43cb66c97ccfc33b09d SHA-256: b4a07da3b8c46b98ea34a2d8e0c955ab44122887e5cd00c045f93a07bc1a1081
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the link farm heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=android+11+redmi+9+pro PDF link annotation
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc3b06017---68724053664.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/15095657695.pdfIn PDF document text
    • http://eternaseguros.net/files/files/17622314196.pdfIn PDF document text
    • http://effektfilm.de/files/file/88586033665.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/49136573258.pdfIn PDF document text
    • http://kme-kme.cz/files/file/rakukaneliluzidipajese.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427811eae0f---69537985582.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/33934630476.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210913213052.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/76744849318.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/jeluwakafokurowageletafe.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/joxoxarutisiwokuxetumusu.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/vowigup.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/xofibefenudusutafajel.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/dobenovexulowonewi.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/33295500334.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/wojiviwiwonizepogimakozug.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/jovabezop.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/ravanijefalinuwugebej.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/bamamikena.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/koxebojetuzez.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/61943910615.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_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 10280 bytes
SHA-256: 6c733526e3a2d3d6abedc98f953d36dd13d96bb39d6c82df7cd60ef5cb472838
font_01_sfnt_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 17500 bytes
SHA-256: 1eb5184acdbaec63224f884a4605132e177342b3c6d9a5f79d22d76613580c0a
font_02_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.