Malicious PDF — malware analysis report

Static analysis result for SHA-256 717be45138c1e944…

MALICIOUS

PDF

72.9 KB Created: 2021-09-12 00:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 52a11f93d6e128394cd37de4d7706080 SHA-1: 4d125df7d0cae57d44d6f20bcc1d9555240d81b0 SHA-256: 717be45138c1e944e94a7a28c91ea352b472f5130f97abe33da31d29fd17e164
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kisikana.hr/userfiles/file/94723958700.pdf In PDF document text
    • https://olgunbey.com/upload/ckfinder/files/65740157111.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/66411309151.pdfIn PDF document text
    • https://unosms.us/userfiles/file/50511937702.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/dudovojepava.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/fijulixixomefat.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/65071504328.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/wowaxudixojejezokamisisok.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/10053127517.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/kutedinobiratezikulu.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/nedudusemitosabomivijag.pdfIn PDF document text
    • http://kgmda.com/upload/files/pesefu.pdfIn PDF document text
    • http://oilspecchem.com/files/3022765580.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/65918053072.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133c21f2b936---lalus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=apk+gta+vice+city+storiesPDF 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_off0000b98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19C 17160 bytes
SHA-256: 7188e3caf930496077016a6ac192890c0b3cd67d2e733391f9de6ad747270ab0
font_02_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 10652 bytes
SHA-256: 93e6992ec36358f6ba603e25708781c410d615f284dec5797452457868602227

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