Malicious PDF — malware analysis report

Static analysis result for SHA-256 666f3caf78d3b3e3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 18:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6665fe0afda3c7e734a138297672ac13 SHA-1: e04c8585f29fdd70a9eaf8e9b7fbbf0dc7c116a0 SHA-256: 666f3caf78d3b3e378d6c31ab62b0e5fcb6d467f02b5f9bef75c9ae98969a245
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or malware distribution. The embedded URLs point to suspicious domains, further supporting this assessment. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://philabc.ru/uplcv?utm_term=c64+emulator+android PDF link annotation
    • https://facades-et-traditions.com/actualites/file/91598495488.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210913061347.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/70284300958.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/vubijagakadedigedututega.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/mugisafobetenokiso.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/nupofabigikulopedejixa.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/95353448336.pdfIn PDF document text
    • https://cooperspick.com/files/vosulu.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/kejafaxetikemo.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/wowuduxalenafunakowug.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/52184344640.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/zefamafiminevowibek.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109091014506960.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/97655745015.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/87940919443.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/16722924403.pdfIn PDF document text
    • https://salonrewards.ca/images/file/45857554410.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/v0i269e8adb48e7lt4i595abom/xugutikogejibutuso.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/3760441683.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/21884858968.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/156a276688c657838b91c6175cb750c7/46389220480.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/bagokibapulakes.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/64693569895.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/62183817900.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/vosizegevubulipa.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/nagidilidivonojamiror.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_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 17100 bytes
SHA-256: 32075dd5f471a651ee8021758caeb3e136365403576c3ffc54bc0fbe76c5337e
font_02_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 10620 bytes
SHA-256: 0ec3395eb611efccf644d1a6d0770c9a1243edcd4ed68dfaca18de4c7cb46492