Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5e92691df35125…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 09:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 691469e046d3c06cc16897f24f0bb189 SHA-1: f1ba08a8dc75a376cd10947c8edbbf80f52d0862 SHA-256: 3c5e92691df351256d136d076dfada75abab1ff6b324f5b7cf3fcaa5182c9109
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the nature of the PDF and its numerous links suggest it is intended to lure users to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=who+owns+google+now PDF link annotation
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/93251506337.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/97784851362.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/tupufotokixinu.pdfIn PDF document text
    • https://computerzone.pk/file/xewotafelesizesasewen.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/tobexanupemok.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/lubasedojogufigi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc2e6a0e9---20319849541.pdfIn PDF document text
    • https://stotex.rs/files/jufoxurojinukizo.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nefugonabupabararefilile.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/12051599937.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109011236395944.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sitagotimerotaveruwizefom.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/ximil.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/pekamevunikeziputejalijop.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/96174597294.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/ravasajepikopesusubilapo.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/nefelurijitixosutenobixik.pdfIn PDF document text
    • http://ubest.ru/images/file/zojuvuga.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/bonal.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/tavugufobawotixemugut.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613031f351ce0---pulir.pdfIn PDF document text
    • http://mamam.by/upload/File/file/mulubiwim.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/fopevesu.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_off0000bb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB53 10012 bytes
SHA-256: 4e1a9f5f2a8ea496132fc2bcd348bbab5252edc207403fd1d43557af1cd6637e
font_01_sfnt_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 17028 bytes
SHA-256: 836fa2b0825b411a7bbc2ebb6d5962156658234185ccc83118503bc622ce9909

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