Malicious PDF — malware analysis report

Static analysis result for SHA-256 2079a146f33b08a2…

MALICIOUS

PDF

70.1 KB Created: 2021-09-12 23:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2250a96317aa8cd6f36734ab5763df53 SHA-1: 962e52b617db1b0975f603d7623552e00281ba49 SHA-256: 2079a146f33b08a2f65054da86ee3919179433b05c337e697095df8e5091fc40
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm, and numerous unknown URLs were extracted, suggesting a malicious intent to manipulate search results or distribute further payloads. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dtyxbpzx.com/filespath/files/20210906023152.pdf In PDF document text
    • http://happyhanool.com/ckupload/files/tutowugamejaxikukosupesiw.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210901110307.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/27807046598.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/zebizadabakagid.pdfIn PDF document text
    • http://nova-auto.com/upload/mevemezilebag.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090903090196983.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/61502010017.pdfIn PDF document text
    • http://altus.pl/userfiles/file/kifoteli.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/61455888767.pdfIn PDF document text
    • http://jawarakreasi.com/file/77632528164.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/rivumekezawupekiwemi.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/58405183664.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/27671898153.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/30322777452.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/3741953543.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/46211504874.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/93738083919.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/98648022475.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/57440099959.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/60798631182.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/xilatiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+tv+channels+for+firestickPDF 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_off0000b3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 15204 bytes
SHA-256: 498f778e027ff8314bbc2dd4ccde43b3599e4c3f2e74f531b84bb48cce99f2e8
font_02_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 10568 bytes
SHA-256: 15c78c5409eeca3d47e88658e6fa9b4a5cd53708ea4e192b299aeb178213e47b

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