Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd19a3bcf680035d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 00:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c87b3b7b5e77d22e363b975ffdafe31 SHA-1: b9fa61a7025b9c3cbebc585a3566b3014c299715 SHA-256: dd19a3bcf680035dfd536e28282d6bcd82c787dfa59dc6d12725a9153618089e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to potentially malicious or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the link farm heuristic strongly suggest an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://studiorapizza.it/userfiles/files/dituxif.pdf In PDF document text
    • http://telecycling.info/files/file/53402965203.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/84407235224.pdfIn PDF document text
    • http://mutitar.com/user_img/files/majidar.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/konuw.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/82773249825.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/40757999223.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/lelafupopimekofizuso.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/60669717247.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vedenugizizufevuf.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/bititujakodorifakidalome.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/jijadunozabuxax.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109131522341103.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/4098271770.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3e306154---63443897213.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/gotejuzodujufini.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/baxat.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/17417808487.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/pogokaretojorotebasepo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/27109768893.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/55714953781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=garena+free+fire+update+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_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 10388 bytes
SHA-256: 935ec66aba5e833fe26105a2e518d36db6c72dc1d8a263cc5c537e01f519499e
font_01_sfnt_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 19604 bytes
SHA-256: e79d80e7543e46c4126bb79833a522304802ca28efd7e824b19977a47d68cf57
font_02_sfnt_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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