Malicious PDF — malware analysis report

Static analysis result for SHA-256 85847760794242c5…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 05:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79db56ffe16e347cb2e318b12bfedca2 SHA-1: 62a7e2bb716c772b38718173ae3b303704921327 SHA-256: 85847760794242c570d6b4ec1b87d34dee452ab12fae0733b24c797e9723815b
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 a large number of external links, many pointing to disposable domains, which is characteristic of phishing campaigns aiming to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to lure users into clicking malicious links, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=just+dance+unlimited+apk PDF link annotation
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/poveroxekokib.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/75851611716.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/govitubuwirowelalo.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/wujivogemexa.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/27413197594.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/jalixigevutafugovidugu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613317b6831de---rikosemufulupu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/mamusupigilafabu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7d167e4dd5cd9475c01dcb51d10e46d0/71070271068.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/46974239475.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210908181745.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632576602_637675f898.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/57191485246.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rigasusasagubej.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/69247059098.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/satuf.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/mufesaduzemutowi.pdfIn PDF document text
    • http://attlas.center/userfiles/file/baluvejivikuvaxuguwoju.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/mexetaxik.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210908045142029707sb8p8a.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/60472102877.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/malujak.pdfIn PDF document text
    • http://citranco.com/users/files/3717859686.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/41710339481.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_off0000b053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB053 17360 bytes
SHA-256: 4d25d812f60feaf8d7243552211a67d7abe8cfb18da636799828c4c0d1464e65
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 10640 bytes
SHA-256: e6decb9e2316fa23f73a573c2f8b24d4c5e0fab079fdcca96730b2560a86043b
font_02_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1