Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d4408b1ebba949…

MALICIOUS

PDF

92.3 KB Created: 2021-03-29 16:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 381052ffacaadc07a78feab1c2495bde SHA-1: 519700594180750d5aa472147ff30d44d03bed9d SHA-256: 81d4408b1ebba949d87b4e08fe9addfbfd542fe2ca82d1460e11915efbff0e7c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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 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.
  • 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://vilenefex.ru/award?keyword=php+7+data+structures+and+algorithms+pdf PDF link annotation
    • http://artrosil.xyz/dorenalipepefojamezajp6mi.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/eea67.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/hjfAcSk/ringtone_maker_from_youtube_app.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/e9ae3f6ee4990.pdfIn PDF document text
    • http://mbfsopg.com/ley_de_biotzrqhl.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/Dhab2N4/bolezukotajokiwuza.pdfIn PDF document text
    • http://luxshop21.site/client_service_executive_job_description05pql.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/jh9VoOl/bandi_saroj_kumar_porkalam.pdfIn PDF document text
    • https://cdn.sqhk.co/nufopusifa/c3gfThf/nujezutiluzemovepuda.pdfIn PDF document text
    • https://cdn.sqhk.co/fujigugi/hejbuij/vida_healthcare_harrogate_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/rizitewav/i6lGkEk/71658261300.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/gimlJgj/horizon_new_jersey_health_address.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/hfC3njb/10931266575.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/jgKiaQY/ratugugugiji.pdfIn PDF document text
    • https://coderscat.comDataIn 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/07800eb7-982b-403d-94e4-666c1d9c543a/2015_club_car_precedent_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5967ce37-e331-4d7d-9bc2-194f1d1a56ab/how_to_deactivate_deep_freeze_with_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cf1be9-bf0c-486c-8d0e-d6d9a3cf4b7d/best_diy_face_mask_pattern_with_filter.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 5652 bytes
SHA-256: df9f7655970fa4b936519a5ca2a6394dfb7c99f285377fbb377808e3c15ba6e9
font_02_sfnt_off00011203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 5908 bytes
SHA-256: e513e9a3c2dd7c9f9de74424188f2489d456adf9c81bc6e10333d35413edd864
font_03_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 11948 bytes
SHA-256: ea246c8e83cd3f90be414e9c267946add4075b61b212ca3974b1c8949b1435c3
font_04_sfnt_off00014be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE6 16852 bytes
SHA-256: 1110326e83281a46d836e7315c3b66f6eab65ed435200c9daac307115319f8a2

Open this report in the interactive analyzer, or submit your own file for analysis.