Malicious PDF — malware analysis report

Static analysis result for SHA-256 c738452791519689…

MALICIOUS

PDF

76.4 KB Created: 2021-09-24 14:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca0c81b9d76c7137a770670cbe033afa SHA-1: 2ce4e1bd217ed7d2d171b9551dccfc9f3734cd5a SHA-256: c738452791519689f78a3599b12cec27ff4b78306cb09704c3305eed9e0b264e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users. One notable URL, 'http://sxhk365.com/uploads/file///40724500331.pdf', appears to be a direct link to a PDF file, likely part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://sxhk365.com/uploads/file///40724500331.pdf In PDF document text
    • http://rallyteamwalraven.nl/file/56827457521.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/pmdcmnag9ok6avc396sbrfsfii/pebavegapaxi.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/kawonegobakoxetamitebadek.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/21444484518.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/jejizeworazozofan.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/motuxekanafipaxar.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/gabejedogadu.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/kakenuludi.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/40348273603.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/fuzorob.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/95048242876.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/suzarexozudubipabo.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/67033606538.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/legaw.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/waxetaradisumozudimebi.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/21682789084.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/gufoviroxaruja.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/83982713626.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/34020935296.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/99109101625.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/damogigipovig.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/90512266878.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420ede2a00c---zupuwogivenowejemiwaf.pdfIn PDF document text
    • http://napiarsaigh.com/images/lalefozi.pdfIn PDF document text
    • http://kalikraft.com/images/file/52826759868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gangstar+rio+download+freePDF 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_off0000c28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28D 18772 bytes
SHA-256: 6add3a3de1588b5670da5e8b1f3c79ce09d2e44d0b379c96b2803676243932c9
font_01_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 10656 bytes
SHA-256: 3f2d421de3b33f187f7c3a0a0cae5f5b4840d46810d055949e2459dd2ab0f914
font_02_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1