Malicious PDF — malware analysis report

Static analysis result for SHA-256 427fb6fa84a31589…

MALICIOUS

PDF

71.2 KB Created: 2021-09-13 02:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da76d5556b20505e3ce10603372e00cf SHA-1: 8c823073c4cb97d57dd912257d38dfe558408549 SHA-256: 427fb6fa84a31589438421ceeee9a589f3c03cc01d29af9175c40895e92f9bf3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to potentially malicious domains. The heuristic 'SE_ENABLE_LURE' indicates the document likely instructs the user to enable macros or editing, a common tactic for malware droppers. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit vulnerabilities or trick the user into executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://peaceinsrilanka.lk/ckfinder/userfiles/files/forepodukawamuru.pdf In PDF document text
    • https://njshore.drinkpoint.com/uploads/files/98251298860.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/visepanonorazanonifuwuvuf.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/38954374700.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///55304440478.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/bokemurebonikokaj.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109130709483161.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/sojigivef.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/felotefol.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210905005558.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/nupedawisifititipodifa.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/7c0d7d64fa5da9130810b409188cb2fe.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/94126713516.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/seravetulu.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210909060258.pdfIn PDF document text
    • http://spiregene.com/image/files/20210911_201815.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/sojazowo.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/31935268800.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/bekugepebixefej.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/1951716213.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/41092678210.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca32986c73---nadavamujik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sorry+to+bother+you+castPDF 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_off0000b441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB441 16740 bytes
SHA-256: 7129af7ad2780ced5d572e78158997387abd8a8e5f1f808ef64fbe664bf0a28a
font_01_sfnt_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 10516 bytes
SHA-256: e4fc33c33d056c1888d240d317718ac14af9fc8db3c601368dc7427cfe5716a6