Malicious PDF — malware analysis report

Static analysis result for SHA-256 b364d713630cf9e0…

MALICIOUS

PDF

81.1 KB Created: 2021-03-07 07:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 33f3a0b7b05b2e5509b5b9d4c37498d7 SHA-1: 2de4358bb548d6c8cf23993e85544b3abce16395 SHA-256: b364d713630cf9e07623b1b5890fc754f5f7c494d05548b6e49c65403760f0cd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://gimoguvi.ru/123?utm_term=ihip+bluetooth+speaker+b%2526m PDF link annotation
    • http://lufoveferezudu.22web.org/asus_usb_3._0_driver_windows_7.pdfIn PDF document text
    • http://samudevupogawi.iblogger.org/public_administration_masters_online_canada.pdfIn PDF document text
    • http://wunuwivibegajim.22web.org/86092898150.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/781bf2bf-01b0-4409-ab23-1a97dbefce63/74818485751.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_e21ed099acad408e88db2f03d4dc7acc.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_3196876ebde14e0ab9e28d0dba7e6a72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e2957c-cc88-467c-b96b-9447448dae27/jadadotepigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e32d989-7861-4745-8932-ff0505bd154d/sitir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168b343c-0e5b-4b8d-a219-d68ef622b556/juwezimexazev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d363c98-3ea9-4fb3-bf1b-dd681229531a/17415643233.pdfIn PDF document text
    • http://gidozowelixije.rf.gd/machine_breakdown_analysis_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/805cddd6-e84b-4173-af0c-8408fd5644de/65827505648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e470b9fc-1165-4e2e-9cad-7b128dd962bd/tujuwavozoxawimutezitosud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b01355-e8a3-45e4-9127-0f8ba3d9e327/gre_test_dates_2020_in_ghana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752f6025-2e9d-45d9-91da-8158b05554f6/what_are_godly_characteristics.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_b8064a28e7ea4f2aaebcae7710040cd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e151e66d-b2f8-488d-9130-023d79d4e9a5/mojibewok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602c72fd-06c2-4dfc-ac59-c2e278987aff/vumovemop.pdfIn PDF document text
    • http://pepebejawu.epizy.com/hollywood_reporter_comedy_actress_roundtable_2019.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_a8864966e2fd4d319e5e61218f42b36d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9486d83a-c75b-4bc1-8c0c-1cf427102323/how_many_calories_are_in_a_medium_iced_vanilla_coffee_from_dunkin_donuts.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_72bc29a3e96c47d6b942ff18a8467c8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24ed0ff-1e6a-43be-b9e2-7be96b5751bd/ipod_nano_7th_generation_tech_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f508a5dd-abb4-44f0-bcfe-72ea828dad20/njals_saga_summary.pdfIn PDF document text
    • http://puwagof.rf.gd/12788661659.pdfIn PDF document text
    • http://legatuwaw.epizy.com/lagitipubekodefogozojab.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 5048 bytes
SHA-256: 3b7131384779c0db1fb73df02955d2bc8a893f5b19b01cfd9f5b52cebc3d5168
font_01_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 10892 bytes
SHA-256: c360c2f82b661b8f3b2559c6f5cf8f2239663e2e589ac87c2ca6c6a96a10e346