Malicious PDF — malware analysis report

Static analysis result for SHA-256 50add945a7197042…

MALICIOUS

PDF

77.4 KB Created: 2021-03-02 22:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 54a3c406bcaceaa42e13c8c3960fdbd3 SHA-1: da559cd044fd555058c762a2c59cd19c71ab582e SHA-256: 50add945a7197042a1e584cc0c50be471e72bccc06079f0ebca05ff00b18137b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://gimoguvi.ru/123?utm_term=woe+is+i+book+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465688/normal_602dc5d4160bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418383/normal_5fce6302bc0a1.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/zibebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496193/normal_601ddaba4f5d6.pdfIn PDF document text
    • http://resukagewa.22web.org/bob_stroller_double_orange.pdfIn PDF document text
    • http://jetavimazi.22web.org/ntr_mahanayakudu_movie_free.pdfIn PDF document text
    • https://bazajiwudimikot.weebly.com/uploads/1/3/4/3/134344454/fizumubutewevogake.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470391/normal_5fff159a47cb2.pdfIn PDF document text
    • https://bonawuxuje.weebly.com/uploads/1/3/0/7/130776103/3813033.pdfIn PDF document text
    • http://lufatomitonad.22web.org/rijuzexelixopog.pdfIn PDF document text
    • https://nadagedo.weebly.com/uploads/1/3/1/8/131858166/8510884.pdfIn PDF document text
    • https://cdn.sqhk.co/fosikikevo/chbhimw/fruit_burst_lip_jelly.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/breville_ice_cream_maker_dial_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zewimu/headway_academic_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/merger_and_inquisitions_interview_guide.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_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 4808 bytes
SHA-256: 3b20d3df21904bfe8f20ba113ee248c40173532cb9485f91f3e87550cf693f46
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 10884 bytes
SHA-256: 0f9ec7440d584a3991f7af1ac2d9f7940c3c46d074a3b15f8de86ad2cf23d43d