Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0b82cded9ee2c8…

MALICIOUS

PDF

84.9 KB Created: 2021-04-01 18:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1d520256c0240ff32c7ee1ef72571e5c SHA-1: ec771d4f8eedb8cc3170ed69504c83fe45e715fb SHA-256: 4d0b82cded9ee2c8cca9c03be5269490fb7fc193d60065efee8051bffeda7ea9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://jottigo.ru/123?utm_term=anticipatory+self+defence+pdf PDF link annotation
    • https://cdn.sqhk.co/wafixagi/rOYdhh8/map_master_for_minecraft_pe_apk_download.pdfIn PDF document text
    • http://shoplus.info/2010_camaro_ss_6.2_enginene7nz.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/Jqaigjb/flash_alerts_led_call_sms.pdfIn PDF document text
    • http://dizogemusulirum.22web.org/adjectives_worksheets_ks2.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/Kid2KB7/jotojukobewawizixomiwe.pdfIn PDF document text
    • http://eglo.club/bank_5_saturday_hoursp81fz.pdfIn PDF document text
    • https://cdn.sqhk.co/rapedipular/eOhe8gd/24478768014.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/gjhg4hj/12912326741.pdfIn PDF document text
    • http://ehaberdevlet.com/what_is_computer_misuse_in_ictx4qy1.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/x7jeyIq/adidas_ultra_boost_dna_prime.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/gPesb5u/18745241882.pdfIn PDF document text
    • http://bavomobes.22web.org/88465196513.pdfIn PDF document text
    • https://cdn.sqhk.co/falugojafat/e1eidha/watch_free_tv_shows_and_movies_online_streaming.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/21830627978gtz11.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/5gzhfha/sutuzumodoma.pdfIn PDF document text
    • http://reduslim-shopofficial.site/anarchy_online_clicksavercwioh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_8ca5483162a641098f9fa1d866924c1a.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_03ef7a885572493998e15bf591be33fa.pdf?index=trueIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_be266d60e6624863b18e7eb3dd6629d9.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_2806e97fbd274dd9ab25be0d30612cef.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_42dd451b5bd345249c56dd9318a1f35c.pdf?index=trueIn PDF document text
    • http://tifusorozuja.rf.gd/geviwifitosupepewufupet.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_9bdc686e46b240ceb2f255a01b803162.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_2d1b2392c640458ea74306e42880fc00.pdf?index=trueIn PDF document text
    • http://vexidolovosope.rf.gd/zekoroxanu.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_dcddc5c0cb9943498a9fd3be5e9b0339.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_0ea8c58d17434bf182e9e1482fcf1587.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_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 5240 bytes
SHA-256: cdd8177409c08da87e8f17f44e21b8dd172d08e68bbede79df309041c85cd174
font_01_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 10864 bytes
SHA-256: f901af0b4dee4bccf8e9580cf6721b017112db90e74d0ce134b3f63e972e62d1