Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be7476365b62ed6…

MALICIOUS

PDF

72.4 KB Created: 2021-04-03 19:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 50bf9120d741df0d14b959565a53b4e8 SHA-1: b3a7f01aeb7c19af7f247f753b330d7c83b2a6f0 SHA-256: 8be7476365b62ed6e8c7ff8cee0ae61fc8e6abe59bb6ceb862c428a119266633
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/123?utm_term=bailaras+full+song PDF link annotation
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • http://wivupivipewezap.mygamesonline.org/top_engineering_colleges_in_pune.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/ijShhqE/planes_control_game_put_out_fire.pdfIn PDF document text
    • http://sayseedokg.com/the_spirit_of_laws_authorcm2gi.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/KmggoJM/15313311457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fd3c6fe00ae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475203/normal_601469f86bbfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_6059ce13cb6c9.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/a60igtC/three_kingdoms_massive_war_mobile_v1._9._171.pdfIn PDF document text
    • http://mon-compte-cmb.best/bireroloqlykr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_6017aa3bcdce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_6026a3704a5fe.pdfIn PDF document text
    • https://cdn.sqhk.co/temegolu/3xhgEhe/391397426.pdfIn PDF document text
    • http://parrrtner.xyz/blank_bridal_shower_bingo_card_templatevsh3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_d4584867760f4314890702f769fee396.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_fa4a2375c04a4a1d84ed5b5c03cd4fe7.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_d6bb7e963db94b3fb8fc1132303f3ea0.pdf?index=trueIn PDF document text
    • http://gofumakexoj.onlinewebshop.net/introduction_to_behavioural_finance.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_32480c06546b43ee927dd4b6d2340e82.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_65157e59eeeb448099d3cfd607f6a06e.pdf?index=trueIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_70ab3df8418b48acbbad71439e51e2ac.pdf?index=trueIn PDF document text
    • http://rofuvawitarul.atwebpages.com/acer_15.6_touchscreen_chromebook_-_silver_amd_a6-9220c_32gb.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_e69a2817745d40de912703b640d96a4d.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 4984 bytes
SHA-256: 84f50a07baa7c10efff978380925bb3e8052c581f3122d09fb45bb0d8d15ef4e
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 10824 bytes
SHA-256: f0dd27aebd3e7e1a1e6946df482726470dda1adf61a9b6da565fb7844e1055a9