Malicious PDF — malware analysis report

Static analysis result for SHA-256 4720189f9dcb6770…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 05:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f918d156b408ffb1cd390bf498ff5de8 SHA-1: 2a8f174bd62b1bc506755df3229ab0511efb0a05 SHA-256: 4720189f9dcb67706c142cdda758da6d9641963454ff763b1c98750cc308b2fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis reveals it functions as a link farm, containing numerous external URIs pointing to various domains, suggesting it's used for phishing or distributing further malware. The presence of embedded URLs and its classification as a link farm strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=ios+notification+panel+for+android PDF link annotation
    • https://duproject.com/uploadEditor/files/27540529541.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/zenokidofakalekakuturiz.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/sefujazilawoxa.pdfIn PDF document text
    • https://geniodelweb.com/file/femazezoluvu.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/zilidajafumojakave.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380b0a65a37---lopoxobinazanomizuzuxaf.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/13928141559.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/pavodipelisebabugufak.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/89647817805.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6130F64CD6C2A.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/foduvotimikud.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090303190868.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/fexakimodolodit.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/wifama.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/sipefuju.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/davoka.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/darotose.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/79420068274.pdfIn PDF document text
    • https://clickbox.ro/images/file/82950994298.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/35650620705.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/83453936543.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_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 19304 bytes
SHA-256: 8e2b07ac7349aa7dfab23bec8a3a48acff8e653669a086a15da673685102b2ff
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 10564 bytes
SHA-256: 387aaec33c90cc840dbe5e74bb78ed250da4626cb0878e64564d2ad6843dc0ea

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