Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a017533e023116…

MALICIOUS

PDF

73.9 KB Created: 2021-10-02 16:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4435e460e8b7fad4c3952a11f9a881e4 SHA-1: 95427041354926da915c802107fac5a148cf4a6e SHA-256: 12a017533e0231160dce9968b9c6988fa16be236336776af203716245f693904
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=the+meaning+of+grunt PDF link annotation
    • https://baoholaodong24.com/userfiles/file/lamexagosokileli.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/vilirot.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210903_1BC60852647A5DA7.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/vuratubideda.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/3741406922.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/58610875613.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d51ef4197e---19104628651.pdfIn PDF document text
    • http://sissonne.hu/editor_up/xaduzug.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/78534263234.pdfIn PDF document text
    • http://spbi.cz/res/file/zezenaxug.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/74313778989.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/92467685306.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/repebuvobowifikufulebixu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kamererokemawoge.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/53376035318.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/10452845428.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/kejedapiki.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/womilewefomunuk.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/bunomapolalokipisexu.pdfIn PDF document text
    • http://millecolori.it/images/file/90679443437.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090914442623.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/17836062062.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/86380100674.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_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 10508 bytes
SHA-256: 730af6aa3a4696d3bed4b63d547cbf055399b271a76e4d1cfdb81b0fe8018de9
font_01_sfnt_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 20468 bytes
SHA-256: 6447cb62df8365627a0829362dc5cccaea15b7798f8fe5fb4bed273212c13765

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