Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a8ec8490d8f8c7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-24 03:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5833ab8ccea9f531d0068331d9b5e6e8 SHA-1: 987d89e1dcbdd415f78eff066989f7f0f192716e SHA-256: 84a8ec8490d8f8c7423dfc454e1c6743dabad4c29c818b82863822cc3abc3603
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this attack pattern.

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 https://krisoc.ru/uplcv?utm_term=delete+snapchat+filter+off+photo PDF link annotation
    • http://wernitznigg.at/files/52326011154.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/27136325590.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/radukuzebikov.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0c3e6a087494125e69343d10e1ce8b72/dezasu.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/vifomizovosepudukijudovem.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/52617369547.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lesemod.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/bodudot.pdfIn PDF document text
    • https://zufiks.pl/uploads/userfiles/files/gazufode.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/16045505909.pdfIn PDF document text
    • http://elsped.hu/files/file/getovejazopovep.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/dabeda.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/90336179187.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/jejesilobezevolepisepo.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/94492231784.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/siguzajoleroza.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/9878292223.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/zunulagevaselugokekem.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/siginaviberemup.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/pexugovufivipapuzupig.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/78157262175.pdfIn PDF document text
    • https://allianztc.ro/files/file/17457617864.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/36762071654.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/94379908219.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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10580 bytes
SHA-256: 449a7b4d32bc54ba31d15aa8a6cded55dcc2456768e85eb213afa488a6820613
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 17052 bytes
SHA-256: 8399b381f9300497c44d8a146f8df9d8f5eedf024101242eb6a2d5f70d174d12

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