Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c89c94dbb40cf0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 04:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09f0c851bbf8d9bf58aa4fc668ebcce1 SHA-1: 6fd0073f568f36bf73205ca5886bc6251f583e33 SHA-256: d9c89c94dbb40cf05d1d6926593087148ed4888e50cd2c89bc9359961a4e23c1
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, many of which point to disposable domains and are structured as link farms, a common tactic for distributing phishing content or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination or host a large number of redirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/2863824357.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307e8547665---84735049326.pdf
    • http://dinskayarealty.ru/media/file/pepeledutotulod.pdf
    • http://darstin.com/userfiles/files/xifirevad.pdf
    • http://polesprogettazioni.com/userfiles/files/4058756254.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/sulozugisu.pdf
    • https://crbz.ru/userfiles/file/vinasizojozenutimasiri.pdf
    • https://internationalmedia.com/userfiles/file/79553591845.pdf
    • http://marktoby.com/akram/know_news/admin/userfiles/file/84920935919.pdf
    • https://brihat-group.com/assets/userfiles/files/bofadizevezusopedolenev.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/fibirulif.pdf
    • http://myucpb.net/userfiles/file/85650616128.pdf
    • https://fedico.ca/upload/editor/file/xoner.pdf
    • http://tcsklife.com/filespath/files/20210901170514.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/11242996192.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210903214635.pdf
    • https://newtech-utm.pl/userfiles/file/54380757610.pdf
    • http://prokoncept.hu/admin/blogfck/image/file/92799589083.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d51c962cd0---14548360349.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/xubisemokanukifenakugaze.pdf
    • http://thekreativecompany.com/uploaded_files/userfiles/files/85441626379.pdf
    • https://12shio3.com/contents/files/2324434230.pdf
    • https://haciendaloscipreses.cl/upload/file/dobarinebefokidekez.pdf
    • http://pekingtogo.com/uploads/files/dazowug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+series+online+app+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76f.bin
32a4c142de317eccdf04ba0f031450e03fd2b47e7928a86b9dbefcde111ae3f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 10604 bytes
font_01_sfnt_off0000ff9d.bin
862ee39900a39375ed86c1abaede9f5504193fb988e47fe0b42236caacf48112		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 17140 bytes
font_02_sfnt_off00012bef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 16792 bytes

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