Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f697674cb25daf1…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 20:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac160a524edf298addae1cdb4a9dabda SHA-1: 6b4776b3ccc0a7ab01ba72c6812bcdf41578553e SHA-256: 4f697674cb25daf1adf198a19b4cce2aace9af186fb907d325eaffe45e270a74
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojanized PDF. Heuristics identified it as a link farm with a deceptive download button, suggesting a social engineering attack to trick users into visiting malicious URLs. The presence of numerous external links, including one pointing to a potential payload download, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=flash+hall+of+fame+100+friv PDF link annotation
    • http://acmemask.com/upfiles/editor/files/gozurizixeruw.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/48491922621.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/20621634061.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/sijotuze.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/74653911944.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/21488444842.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/28073725551.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/64987032491.pdfIn PDF document text
    • http://tunhuaduytan.com/upload/userfiles/files/fitakiparevipidovid.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139bbc3e1863---69130660370.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/94697234988.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/vujesajudojokidolilunixiv.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/kobaxumilira.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/lozalo.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/30935592705.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/26863795996.pdfIn PDF document text
    • http://www.siposferenc.hu/html/39598261351.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/83044126.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/fajomaterepidiwox.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///bexanel.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/sokanofoneju.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/gixadiwudevetisisajifosug.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/2440203713.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_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 17044 bytes
SHA-256: e266fe8f6d5a0e4b089221772d78ed3d14552b02e84b39ebadd26da58b0c17ba
font_01_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 10496 bytes
SHA-256: 3cda8e5ae747c61b1422a564785159e3c0da1899b32ebd0fafb9c274fa6a0ac3
font_02_sfnt_off00013190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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