Malicious PDF — malware analysis report

Static analysis result for SHA-256 a666f450e50ba3c8…

MALICIOUS

PDF

102.0 KB Created: 2021-03-27 15:34:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5cb74202398d9e1c8ba1510baf13d58d SHA-1: 6b15b2d6dd945904ccc114c78044709717992d3d SHA-256: a666f450e50ba3c88c062cc3dc09cc717d5218238b7e279bc74428fe62fcbf72
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 specifically pointing to 'soxebez.ru', suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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
  • 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://soxebez.ru/123?utm_term=cisco+esa+c695+datasheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410989/normal_6002666868b80.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/application_for_employment_example.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401711/normal_5fde5a7e1e1d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_5fdb9d318cd6c.pdfIn PDF document text
    • http://pizibameku.iblogger.org/algorithms_and_data_structures_in_python_srinivasan_jagannathan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5ff113003d5f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484618/normal_5fe4e6b0d54f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_60247e9517707.pdfIn PDF document text
    • http://tebogekememesij.mygamesonline.org/lasekivoxunaw.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/bijofepowokogasufizalajop.pdfIn PDF document text
    • http://biwumani.mywebcommunity.org/power_of_attorney_act_1882_in_gujarati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_60261fd975e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_5fd6aa73d6911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_5fd8b2a9e43be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413968/normal_5ff675364ba01.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/resumen_del_capitulo_6_de_el_principe_de_la_niebla.pdfIn PDF document text
    • http://fedezin.scienceontheweb.net/toniboba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_8f07e1080b3e4110a8b19d4347f6ab0d.pdf?index=trueIn PDF document text
    • http://ruxuvejefo.epizy.com/gumekowupagajiwozilo.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_3b97b31b93bd434c91cfbbe492ad8397.pdf?index=trueIn PDF document text
    • http://zukurofumajigew.epizy.com/steroid_injection_for_tennis_elbow_side_effects.pdfIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_42cc8890bb4c478dbea8a8c070dad7c8.pdf?index=trueIn PDF document text
    • http://bigibejunewolov.rf.gd/agricultural_marketing_infrastructure.pdfIn PDF document text
    • http://buketoxepebaf.epizy.com/zudetifojobabixedemima.pdfIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_9a84204d9db24e239c5e2452fcba8f15.pdf?index=trueIn 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_off00015235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15235 5236 bytes
SHA-256: 413f215cec0aefe7219d160107049d1574207a5614bbf5509840b3a370e1e0cd
font_01_sfnt_off000163f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F7 11460 bytes
SHA-256: de0ac58a367525681fdad9c90592853ab74bc054bd5eb8454b5f520a3387382d