Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee39a6fe0abb1fb…

MALICIOUS

PDF

74.1 KB Created: 2021-02-23 15:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 216933762a6037838594af10dff0ba33 SHA-1: cf0376814d5ebe51e10b9b660b7e0060610399d4 SHA-256: 2ee39a6fe0abb1fb82abb7f3a1e8ca060d49a9c62c4dd9a173230478ef4fac5b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to 'constitutional law textbooks pdf'. The presence of multiple disposable hosting domains and link farm heuristics further supports a phishing or malicious redirection scheme. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

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://jacksth.ru/wb?keyword=constitutional%20law%20textbooks%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408862/normal_600fbbfdad22c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_5fe804e3c1117.pdfIn PDF document text
    • http://bebodepana.22web.org/gijanuluvage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5fd15432ed663.pdfIn PDF document text
    • http://kelirajisob.66ghz.com/asus_zenfone_2_laser_software_update.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5ff332ad73703.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/jdugfid/nasaparakogulof.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/idifrwM/detabesofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413475/normal_5ff218afa0aac.pdfIn PDF document text
    • https://cdn.sqhk.co/pomisiforuko/aiiiiZc/85101846136.pdfIn PDF document text
    • https://cdn.sqhk.co/xaloridinef/fj7o6je/34696018888.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minirulo.epizy.com/elazko_philips_azur_performer_calc_clean.pdfIn PDF document text
    • http://javasuk.epizy.com/lunilesivupawe.pdfIn PDF document text
    • http://gatafowe.epizy.com/bharathiyar_photos_hd.pdfIn PDF document text
    • http://jalafud.epizy.com/tizulu.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_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 5208 bytes
SHA-256: 29e15de9ebfae02139ea1d3db51a22aae519b64d5239f3ab14f30180506212e6
font_01_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 10776 bytes
SHA-256: 545bbda9c4c633a567d926d676e0b277be9a6d83d87847b5b46a66bed24c65d7

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