Malicious PDF — malware analysis report

Static analysis result for SHA-256 e773aca98e8596b4…

MALICIOUS

PDF

74.9 KB Created: 2021-03-10 20:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4f53f6d0ff542c8dc9851a5c97230d13 SHA-1: 823830a857562522e3b2ba9e3d52a6958153842e SHA-256: e773aca98e8596b40eed437b6609adb860c6aa3b036b1b03dc491484e762187d
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://nipisod.ru/award?keyword=admission+essay+sample+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365567/normal_600d5f134eba1.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/dafovewofifisi.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/hiIjanY/dulubakonepasuzajip.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/how_to_become_a_medical_laboratory_scientist_in_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/dmD9iib/aplikasi_beli_pulsa_listrik_murah.pdfIn PDF document text
    • http://nikaold.site/80137298209sa3ny.pdfIn PDF document text
    • http://azakalaza3.xyz/fumifugubonikens6qv.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/J5gyjcx/xedavoxiteman.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/fositibovopuxuduf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5fd1c983ca6a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500670/normal_5fdeb41abdccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_601e406678864.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rufiramomu.rf.gd/contour_next_ez_lancets.pdfIn PDF document text
    • http://fidawakuxut.epizy.com/11167583220.pdfIn PDF document text
    • http://fibafewupo.epizy.com/arundhati_tamil_full_movie_tamilrockers.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_53f991b2b11c431db3a72ceb0e3c2cfd.pdf?index=trueIn PDF document text
    • http://polepugel.epizy.com/11531310052.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_948ed9ee8cad4952a0162e2bdbb1a10a.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 5184 bytes
SHA-256: 07763ce8cbfb0637027a818a21adda5190ba5d405e0c7ba66612069599e05099