Malicious PDF — malware analysis report

Static analysis result for SHA-256 c963f246b40fcf8e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-12 02:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b56f7e7a15fb73234f6b28cdd4cd9db SHA-1: ef1a2f919a75a49e08de99e641d58e3bc8a35ec4 SHA-256: c963f246b40fcf8e5bb8fc43bc074fe064ed0cf89f516cdcce920a21c37b8d96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to potentially malicious domains or are part of a link farm. The presence of these links suggests the document is intended to lure the user to external resources, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://imosa.asia/uploads/files/202109021927547289.pdf In PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/22442234151.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/17121297672.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/67689125258.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/77291226632.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/51449646374.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613196290dc04---63763683890.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/43527606489.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613029f3e21e1---5250949742.pdfIn PDF document text
    • http://msiutilities.biz/documents/82037684482.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/73455094250.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/23905106656.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/52731075031.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/mabiz.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/genorimadilowolawili.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/gigelavutagi.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/35690702511.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109032103203221.pdfIn PDF document text
    • http://specialcats.nl/media/files/40860322376.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/tiboresodawowobupokew.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/dadukugap.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/58430725739.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/18502235812.pdfIn PDF document text
    • http://skomi.ru/img/files/file/lurasenikulimaxamifatuzaf.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/33836662404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+upload+contacts+to+icloud+from+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_off0000b80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80A 15048 bytes
SHA-256: 4b25c668807fdeabec52633d7b60d6121ab32b592901501845ff95f6aad516a1
font_01_sfnt_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 10828 bytes
SHA-256: 2a5c9c21c1514f750fa4fdd60d827c55f10f69be551d340d42011e9a89904602

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