Malicious PDF — malware analysis report

Static analysis result for SHA-256 f003791148370801…

MALICIOUS

PDF

79.4 KB Created: 2021-02-26 12:15:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 213f573856b3771e00c14e5431d079b0 SHA-1: 858d21cb891580398fc04364fd20ec8034a96f0a SHA-256: f003791148370801a21f9012e8119210d652cad5d2f9c34af67040fab9da0f50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely through exploitation of a PDF vulnerability. The document body's content is obfuscated, but the presence of URLs and the heuristic firings point towards a phishing or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=android+app+development+cost+in+india PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381095/normal_6038512b55416.pdfIn PDF document text
    • http://gesufumepemu.22web.org/besevofew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_601455776b21a.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/AGhfHhc/cheapest_flights_from_glasgow_to_london_city_airport.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5fe25fecc1650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368488/normal_5ff2a4e693c11.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/9gcaihc/drift_clash_mod_money.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/FgjnZ7z/nozirofujatikezikexoxes.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxukulalodi/hJficBS/recargar_celular_movistar_colombia.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/what_should_i_do_if_my_heat_pump_freezes_up.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484370/normal_60198a630be7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5fcf3b9a727b9.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/fopalew/zimowusigetew.pdfIn PDF document text
    • http://jokosen.atwebpages.com/axial_ax90054_yeti_jr._rock_racer.pdfIn PDF document text
    • http://xizijerupo.rf.gd/zonilusizadovadogavuga.pdfIn PDF document text
    • http://rodijegowufewap.epizy.com/lexetabasazuzifosojo.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/14118111172.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/1373336205.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/black_et_decker_workmate_2000.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/zisop.pdfIn PDF document text
    • http://vonanovab.epizy.com/iowa_dot_design_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/22459679480.pdfIn PDF document text
    • http://bojilukirifep.rf.gd/76414893259.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_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 5268 bytes
SHA-256: 4d1f11d73ae474dd1b089fc9198c4e2c81dc5eb7743d4bfe960e690b779caef0
font_01_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 11016 bytes
SHA-256: 9cf1260c59cad3bbc65ca999a2e54a0cbedd8f287fa0441f7dbdf8d993092972

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