Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e18366c2dc43ba…

MALICIOUS

PDF

82.6 KB Created: 2021-10-14 11:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4b408dbce8d6651bf40f031cb8bcbe4 SHA-1: 5ac7e9e085370e7b7fc02346fa82a34ab76d704f SHA-256: 83e18366c2dc43baf0142f2fa2e7a06de8e15903334530895ad113e2291e6c62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggests it's intended to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=how+to+record+facetime+video+with+sound PDF link annotation
    • https://tese.in/ckfinder/userfiles/files/20278250886.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/39943966549.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/8655875279.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/sivasav.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161590f845c67e---80867073170.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/18644863112.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/55682209906.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615322f2518bb---21431722828.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/miduwukupi.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/jawimozurafilin.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/82293888724.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/83095570458.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/97566994178.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/72990303663.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20211005144341.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/ledalebalebejaf.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/denidevolimajabafalolove.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/85115686872.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/1039750034.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/31178174881.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/dekoveruxo.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/sinebawuxigeribuwasiga.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/33364548821.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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 10936 bytes
SHA-256: dbcd81883ddea2eeb8b9b59cdbf0d4c282ae76b9399d5977ff96cc13f2f43e96
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 18372 bytes
SHA-256: 9356d52b8ad279cf7b24599c585ca7c7a4a74485965c5aa4c281ce3b020047c0

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