Malicious PDF — malware analysis report

Static analysis result for SHA-256 38599e1c3d117f7a…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 15:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2efe4f7bc06207c76507eba8084800c SHA-1: b05c0a883730ec180ae90e57b5c139a74cab3262 SHA-256: 38599e1c3d117f7a43dc66a8e79ebf01d007a716c640691e38b93aee6bfdc6a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=jaya+hanumana+gyana+guna+sagara+lyrics PDF link annotation
    • http://ecoaga.com/documentos/file/xapaluretovabebajirowimep.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/wazotom.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/59995433467.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b4tlnkt0ecj76qv7v8512v2i15/66509640724.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210905_91B6990856B27BE7.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/vosuwukigi.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/70214026309.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/73647436915.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/17743943662.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161477fef39a98---sububufopuj.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/86294173106.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///xenojus.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/bizosotejiteduwaliweris.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/44449367400.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39437299129.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/xevumewidi.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210902_99E914EDB8EC8C7D.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/bezetujalonawebudiwok.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/murizuxijemaxog.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/jowozagaj.pdfIn PDF document text
    • http://kdekdyjak.cz/data/30403856182.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/moforadipatowiradudop.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/sawojosanelerebitevuk.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/83516250938.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_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 10532 bytes
SHA-256: 88a9cb530d96afc709c2925a7162321aac7f896300ed38bd3f5d36bd1dcff573
font_02_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 22412 bytes
SHA-256: cfe9d5da019355c495cfc340a706d15e0e031d5cd008f18aa4dcf773fb51dcab