Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e307056ec50c90…

MALICIOUS

PDF

71.9 KB Created: 2021-10-07 13:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e90696bb385d038e20a2a89cc585464 SHA-1: 6e52dd698ac54857be06bbdcfb11b5427227697e SHA-256: d7e307056ec50c90404601ba2f853f8d83b0df489b75dbe68f3b0e52f0dc635a
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 high likelihood of malicious intent. The presence of numerous embedded links, identified as a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://ketchas.ru/uplcv?utm_term=a+mathematical+view+of+our+world+pdf PDF link annotation
    • https://www.babetravelling.com/ckfinder/userfiles2/files/35901191026.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5724fbf3cbb8f44c47d1bf0937ebf244/74926835009.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/porekazaxodekagifat.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/vubenaro.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/vubefimoluvup.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/fusizodijujorumer.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210922201545803.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/50904505053.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c41cd59c64a5bea927ed7f8704c2446c/sowibevigifuzafezirisogis.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092215061573499.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/lorebaporurazole.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/42335542528.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/48303187029.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/zegigar.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/76859099184.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210928185908.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/petugezesadasajigivaz.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/lenojobet.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/jadoro.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/jebijikaxejigikenale.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210929124913.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/vikidasaxonewemejiru.pdfIn PDF document text
    • https://vzglavniki.net/data/file/26536681221.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/wugetapud.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_off0000b860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 10844 bytes
SHA-256: 3464ed317019ffd538335b497ae201f6b677224ea2331ac2a5e7ec61e272b708
font_02_sfnt_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 15792 bytes
SHA-256: 5059d8036beff63712e1f4f99163aa6a91e81aa9ddf6acb426c7e47faa324b71