Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b99a67140a8f18…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 12:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4ec438cb8b1a6106a339dda3f187d81 SHA-1: 25944e1d57a18772e8341f6ab3712b65839fb8c8 SHA-256: 02b99a67140a8f18cc76df61f0613ec4b4c103ec72251b3930918a4ee93e5e0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, many of which point to disposable hosting or are part of a link farm, indicating a strong intent to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of PDF malware often involves exploiting vulnerabilities or embedding JavaScript to facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83a364293---xibisomeparakawilo.pdf In PDF document text
    • http://maimungkorn.com/UserFiles/file/60933192757.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/36856990191.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/sovivo.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/wagubinuzowidagem.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/semisiginaperoxalez.pdfIn PDF document text
    • http://midospa.com/upload/files/gexizimonirulexibisubuwa.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/volirarumetep.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/27527980621.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/jelojolunusowufu.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/xuminizugew.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/27001990069.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/dofozir.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/xuluzuwebegagefu.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/68350305940.pdfIn PDF document text
    • http://lawngo.net/fckfiles/6736110657.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/puxuderipolazeti.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/kodokadasotivojoz.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/nikigekexux.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/75845461137.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613689e0a3164---4731088388.pdfIn PDF document text
    • http://anpo.vn/upload/files/jibijiwidowusovot.pdfIn PDF document text
    • http://art-ball.net/files/file/jabaxam.pdfIn PDF document text
    • http://www.polni.si/Images/files/57938896329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=receiving+text+messages+twice+androidPDF 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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 10968 bytes
SHA-256: 4553cc114a016aca163d53bb79684997742b5e9c17637e1ccd6275da4c3c01a0
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 18120 bytes
SHA-256: 446fa22e482e5f68caef1441b7917baf112cf41743b1e0e60158957420cc9ea7
font_02_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1