Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0543e56f42df46b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 09:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2e670ef57f66429e495be9159e0f042 SHA-1: 2cef0ea438c7699c1053ddc8ec7052c400a3bf3f SHA-256: c0543e56f42df46b4532fc4225514955b41fa157de65adcd9cf935d88f42db56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=autumn+words+that+start+with+d PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f4ea36c2---gejebixejeb.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/pevetoluboxekutugeku.pdfIn PDF document text
    • https://phuquiland.com/upload/files/43793368147.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/koxukani.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/76799670375.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/josaguxabidemajileretaze.pdfIn PDF document text
    • http://balalajka.nu/media/7697133725.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/tibujotijesetilin.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/84434995035.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/fabojopukebovex.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/zexijefaginifijowe.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/silelisejokuwiparepij.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/1610001283.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/pigifevuzi.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/sovifupepevisomijidakada.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109010730588224.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/26550924283.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/99352123581.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/pisixezim.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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 10500 bytes
SHA-256: bb762797787285445e8f37f5171ecf25be1ce53734c64c7ab1625108f6d14843
font_01_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 19800 bytes
SHA-256: 604ed0a9cb7041caa70dcaf88a37df15a05aedca0a91110aae8763fa9ab28ac3
font_02_sfnt_off000128ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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