Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f21203856ea1a3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 03:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6db629ba9b03337b8733ba7c157f799a SHA-1: 06102037de6794786380e5ef637d4519564f2993 SHA-256: 17f21203856ea1a39ce7005f9022de9ee29128c57e53389ee94c12cfbbc53ec1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=free+fire+offline+mod+apk PDF link annotation
    • https://netwindowvn.com/uploads/userfiles/file/22155402693.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/61622523521.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/fakenir.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/pazifomimidovexogabuzusij.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/zelakuxefatobizad.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/januzikerav.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109230113102305.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/52791525198.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/zepitezukomumu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/45250125182.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/gefezunibukatujemebope.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/zabidupisasefirodixivagox.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/pokodu.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109061805105203.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210913224751_560473275.pdfIn PDF document text
    • http://vinmexindia.com/uploads/99997622393.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/27098247993.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/10515776051.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/48867286649.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/wisopagasapofaxexudawofop.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/pujivexulazefibasonagexu.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/diliponizevobu.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/jiwedikazinumupuzuj.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/86238050536.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/90925794954.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/pegizeruwufewok.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_off0000b474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 10460 bytes
SHA-256: 1be02452773fc59f308771af81e8fd573a5c990b3a9d179ecb37f3abd0f06372
font_02_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 15544 bytes
SHA-256: 387cdfd3f3a7e465fee2e15472eb5214745cf63a0bbecb2377abdc41e7f4cde5

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