Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5519f2aec1af449…

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 07:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94b71d2704ab58c1ffa3115155c1b15e SHA-1: 5a95fce1b85f7f3586029443a9997f73ee0fcce7 SHA-256: f5519f2aec1af449e2103ed9b867b68122e3a4f52717d37fd943cbcea753bc10
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming, suggesting the document's primary purpose is to manipulate search engine rankings or distribute malicious content through these links. While no scripts were directly extracted, the ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 4

  • 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://traiteur-ribot.fr/userfiles/file/27983000944.pdf In PDF document text
    • https://parlagame.com/calisma2/files/uploads/wepuf.pdfIn PDF document text
    • http://juentai.com/userfiles/files/zuvanekadakexar.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/71618593002.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/57966304520.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/82595849532.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/8602669140.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/xarejoza.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/buluvipidenorikeku.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/wenosolavefatebajab.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/19577418306.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/74570642359.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/40357351118.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/wogirajadixetekuvixigeris.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/44546419631.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/razukudurenu.pdfIn PDF document text
    • http://underbutter.cz/download/foto/lidozoketalirotagotalo.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/kojemalavimetuse.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/77677176497.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/87427336578.pdfIn PDF document text
    • http://synhbio.com/upload/files/68476225776.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/xazevujatatokewotevopazev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=farming+simulator+20+lite+mod+apkPDF 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_off0000c2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F7 17256 bytes
SHA-256: b0fd5d5cf41f3f062dff1ce3ec28d2292e760964551148882089cf3fb025f3cb
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 11148 bytes
SHA-256: 596a7647f35cf3575ec961e61ccda83ff54c80ed3266e2e05f101d4f20d28768

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