Malicious PDF — malware analysis report

Static analysis result for SHA-256 35564d30c5f06fea…

MALICIOUS

PDF

71.1 KB Created: 2021-09-14 13:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 064fb7ec78cf72c3c0a52afc2ccfed58 SHA-1: 0e93fb62ff76c0e5aed7fc0fe48bb294703da8d4 SHA-256: 35564d30c5f06feab50c45c8121eff4161e410d2e66fa51756d24e714e4a4bcb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://faw-asia.com/image/upload/files/27731907137.pdf In PDF document text
    • http://gerastar.com/userfiles/file/rejoderuxinubomuvigemo.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/6991600088.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210910060508.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///vufokunodilefurabasosin.pdfIn PDF document text
    • http://netflor.pl/upload/File/tejoja.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/3196422007.pdfIn PDF document text
    • http://vlajamo.cz/images/file/xojupowafifoxebadolor.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/mibol.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/beverixu.pdfIn PDF document text
    • https://combrooncom.com/contents/files/matokavagegovitupof.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/55376311510.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/64567395364.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/74777277429.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/nikepatifate.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/63797956985.pdfIn PDF document text
    • https://susta.vn/userfiles/file/14227429521.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/vobesi.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/bobaviwogoxaxawizewidasok.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/50579168050.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140372f49d5f---83341923326.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/3361407975.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/77066032328.pdfIn PDF document text
    • https://nada70.org/userfiles/file/pumibipufepuf.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/94444613292.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/67236908768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=caja+file+managerPDF 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_off0000b4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F6 16532 bytes
SHA-256: fefccf968ac5e429ddd119329fca372c7ea79378fb557f4760820b07309af0c2
font_01_sfnt_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 10332 bytes
SHA-256: 48c0838bdf75b51c9141a6347199780941bd26ba9234a2a199b8a9bf7c3d9724
font_02_sfnt_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1