Malicious PDF — malware analysis report

Static analysis result for SHA-256 1554824326191c7b…

MALICIOUS

PDF

77.4 KB Created: 2021-03-30 12:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e788ea4a9bbfa144044fc2c81e935df1 SHA-1: 905fa133250a980e76036cc15beec97ad6bc1b64 SHA-256: 1554824326191c7b11b820ac4162484f608dde15a17bf02699436f7fa90c8ca3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous URLs, with at least one identified as potentially malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://kuzutuzo.ru/123?utm_term=baby+blue+eyes+song+free PDF link annotation
    • https://cdn.sqhk.co/xovinexesun/tiho84f/business_insider_today_mushrooms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_60336f3d67454.pdfIn PDF document text
    • https://cdn.sqhk.co/fusevatuboxa/iaZhbjb/95210752329.pdfIn PDF document text
    • http://manaxupupili.iblogger.org/kobadefivimumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_5fd0eec7d0c83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_5ffa912a40cef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_606140ce85a7b.pdfIn PDF document text
    • https://fezivalolir.weebly.com/uploads/1/3/4/4/134461714/vevalop.pdfIn PDF document text
    • https://zomereke.weebly.com/uploads/1/3/5/3/135397468/duruzixutar.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdfIn PDF document text
    • http://pidejofejan.iblogger.org/4694902844.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/miaShfT/53782914870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_e55d0c2243d14e308d392032f5b88899.pdf?index=trueIn PDF document text
    • http://tovezujatim.rf.gd/how_to_create_playlist_on_ipod_nano_4th_generation.pdfIn PDF document text
    • http://nagurinetawami.rf.gd/bodyguard_season_1_episode_6.pdfIn PDF document text
    • http://gasapiloxa.rf.gd/twilight_saga_2008_tamil_dubbed_movie_download_tamilrockers.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_5c70d5864a3545e79e29123a3db6a581.pdf?index=trueIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_e8edddc7719147fe9665793238846fb5.pdf?index=trueIn PDF document text
    • http://nesixisimefol.epizy.com/49104162022.pdfIn PDF document text
    • http://fuxozodox.epizy.com/welojofi.pdfIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_834f33ed04e74ea2b9b9cf71697f0e1b.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_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5228 bytes
SHA-256: 3bcc79bfbfee05193020eaafaaf83a0300abb27449c4fc7eb8379350b3f53c8f
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 10664 bytes
SHA-256: f2e415524e767d64328342e7e99e062e05d45241ae1a6ef07fc8bf6895adc2d0

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