Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54742cd920fd73b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 20:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 183ed6f70cb1ee30b3a097969ce03c2c SHA-1: 77d255b1d33db9d2c7979f53fb76ba7ecccf91a5 SHA-256: d54742cd920fd73b828685fc88fe7e66bdabf2dedbe49cd1fec81755bb60650f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=tv+iptv+apk PDF link annotation
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210903023320.pdfIn PDF document text
    • https://nyig.com/files/file/dokojewe.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134b07fee516---69694683654.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/2217117219.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/87764976204.pdfIn PDF document text
    • http://videocycling.info/files/file/76794823510.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/73233909108.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/boduli.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/niwenukim.pdfIn PDF document text
    • http://cartopack.com/Images/file/91598289534.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/60550327101.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/52560196634.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210913020745.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/91909571536.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/ruzugedolidot.pdfIn PDF document text
    • http://rooptex.com/uploads/libemoguzewipaliv.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/22993157930.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a2cc380e---81342413427.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/3611784920.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210912011503.pdfIn PDF document text
    • http://unityproductions.com/upload/files/13785318929.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/2982898788.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_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 18644 bytes
SHA-256: 53553f0f8460b70032ade8fe4948401d17e049ae0b8770030769e2b36635dfbe
font_01_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 9696 bytes
SHA-256: f506a5bc2d80c94156ae76e8ef0e85c809dab432952ee8e1bf7c608f9df1fd4d
font_02_sfnt_off00012489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1