Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc896efff7491c31…

MALICIOUS

PDF

74.1 KB Created: 2021-01-25 16:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 60ce24cd51f66e2d0f2a191f2a4b865a SHA-1: 00f80bd5a07b11198ae2efee29c1d304cbec9a7e SHA-256: bc896efff7491c31cf540ba9383db2eff8cb5da68877cef579286c9bc1b0b88d
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and external URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=freedom+apk+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370068/normal_600980e66da2e.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/dCzgde3/floor_puzzle_heroic_zero_hour.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/lujolipezo.pdfIn PDF document text
    • https://dekilaroturiti.weebly.com/uploads/1/3/1/8/131856809/kaziwagenet-fopavidexudusos.pdfIn PDF document text
    • https://cdn.sqhk.co/bivaxijo/2hhALKO/bikuwujifufekowop.pdfIn PDF document text
    • https://vadewowiruku.weebly.com/uploads/1/3/1/3/131382700/negerulisesesa-gejafomoz-vafijumu.pdfIn PDF document text
    • http://trenketo.buzz/psoriasis_scalp_shampooxfqrs.pdfIn PDF document text
    • http://bloomwithdeanna.com/16370282633j31dz.pdfIn PDF document text
    • https://sibubusede.weebly.com/uploads/1/3/2/6/132682984/xunebufutesiri.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/khhaMYF/best_zombie_shows_on_netflix.pdfIn PDF document text
    • http://vizionsmc.net/league_of_legends_mod_apk_android_1azvhh.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/mujazowamunebop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473064/normal_5fea1e6fae255.pdfIn PDF document text
    • https://ronunute.weebly.com/uploads/1/3/1/0/131070227/bojasos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepezip.epizy.com/android_app_store_screenshot_sizes.pdfIn PDF document text
    • http://godutiliwaganos.rf.gd/75608536241.pdfIn PDF document text
    • http://birotizedu.epizy.com/dawagaledesewomikiwetaget.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_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 4916 bytes
SHA-256: 1c10c9221caf99407d2c1ac2ed4236f96608d2a3c570d0562f47b00112cce049
font_01_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 12392 bytes
SHA-256: 36882a674b1ecb18c8eb5446bd7fae4fd86b91d4577ac1c1e13c62bbb84cc1c0

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