Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72a8061b279dbda…

MALICIOUS

PDF

74.5 KB Created: 2021-09-13 01:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c4f27c1965fbe037b6ee909e8676f60 SHA-1: 74e16cb7557ba7a6a972a6d57c18973e7f5974b7 SHA-256: e72a8061b279dbda033974d2cde0fcddb979050222932c0b42906f31ef6c65b3
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 or trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The 'utm_term' parameter in one URL suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=tamara+2016+123movies PDF link annotation
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/19310294161.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/fodipow.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/47709816879.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/30357003102.pdfIn PDF document text
    • http://merydian.pl/nowymerydian/userfiles/file/2238038962.pdfIn PDF document text
    • https://kawanmto.info/contents/files/95521004766.pdfIn PDF document text
    • http://emeat.ru/var/files/79824065012.pdfIn PDF document text
    • http://emaaravm.net/upload/files/17961190081.pdfIn PDF document text
    • https://fasleh.net/Files/files/99852076441.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/72354069669.pdfIn PDF document text
    • https://wrd13.com/force/file/rusifeg.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/wotalal.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9acf84655---bilewemelagawavulew.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/6871061045.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3770b350---29108410795.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/20859658130.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/gukivapiloxaxafekaxanuli.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/34898747173.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/mukikozotari.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/robupujuzigesapepijimukez.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/75616425457.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/riladujuvozarojil.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_off0000bc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 10684 bytes
SHA-256: d01c44a43be9b3549b829bfd8207429cbdfea4de0925bc0437845c9f6df52e31
font_02_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 18588 bytes
SHA-256: 19b6ec9ade58ade0ddb1e12345e7b509ee44256eb484efe9458d7d5fea7fce9c

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