Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d64e9339083c2c3…

MALICIOUS

PDF

88.1 KB Created: 2021-10-10 18:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 675446f4c9d2d3022f2ce1d4d273e0fb SHA-1: 4530ae1d4b98cc2305fa8eb1b0036d98fff5fb21 SHA-256: 9d64e9339083c2c339ecd3442a2c6f1d106198c5f4f7d05b6e8eb21f9c64355c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=the+amazing+spider+man+2+game+pc+free+download+full+version PDF link annotation
    • http://crystal-lamp.ru/uploads/files/48291683783.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/lojinudikojuz.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/mijaletom.pdfIn PDF document text
    • http://sparkpro.lv/content/file/76688883471.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/92434341638.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/35520629667.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/13255715108.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce114a37a5---zenevexemulidolegusimi.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/3632112345.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/lekumajisaw.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/filadinebulob.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/xilejugodefelogowokabex.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/nawegakeditoriwuno.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/binubegegogupasar.pdfIn PDF document text
    • http://domuran.pl/files/file/lorinisarotefijigeranep.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/62929958858.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/82981033610.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/fojeguxadewimozuvet.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/73365565828.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/bixitivepin.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/47221928071.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/16654987103.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/27522300045.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/bubivobamelawile.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/89929224412.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20211006010227.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_off0000df93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 23832 bytes
SHA-256: fee2883badaedbf5434536f3767b314ea8ddc7e20420029afc86bc4c45916182
font_01_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 11364 bytes
SHA-256: a582adf630c92b756dbe831e3a42f5f2b056bc89eb6a551b6355ab5cca2aa812
font_02_sfnt_off000137fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1