Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f837882e22a7ee…

MALICIOUS

PDF

75.9 KB Created: 2021-10-02 22:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a0158ee25189866adc116ca0b92b6d5 SHA-1: 56cb2ca8ebf04ffcfbbed99c461086505b69b05c SHA-256: b7f837882e22a7ee9550709e75b4828f0ea39277309186399ec77e47daab2945
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nanobubblevietnam.com/uploads/userfiles/file/siwak.pdf In PDF document text
    • http://jowinbio.com/upload/files/202109111453347061.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/32943824081.pdfIn PDF document text
    • http://cascad-trans.ru/files/74283877002.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/xizibenuwutilewadabuza.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804c992823---vapojate.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/95383999763.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210921153446_21wl3s.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/32565388713.pdfIn PDF document text
    • http://zeci.nl/im/image/geturorudupip.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/guriledojozaligidijaresa.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/81988682331.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/6526299357.pdfIn PDF document text
    • https://buzyhub.com/files/91103184638.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/7787875528.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/42451266947.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/afc8839e2ce6ed60eac739e0988df5c8/51110666961.pdfIn PDF document text
    • https://value.ae/userfiles/file/dinarewu.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/6491039077.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/86749805705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=factory+balls+3+answersPDF 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_off0000bd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 19460 bytes
SHA-256: bd0369d254ba9ec03cc3df12549657c6d2a4a9f92621c40400aee5397a6db033
font_02_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 10620 bytes
SHA-256: df4bce7d58b091ea3ce7e0990652c306c67cf512ecb4e21cc5d0f9a52a07d3f9

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