Malicious PDF — malware analysis report

Static analysis result for SHA-256 36027b62e94e8909…

MALICIOUS

PDF

72.1 KB Created: 2021-04-05 08:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 53eea55e88bba4801bde15c97ee68e50 SHA-1: 09971c78b512a61a3462c3bf3a91398ef4c3be49 SHA-256: 36027b62e94e8909a9f2b8d851a159bef29e5db1647bb1173d5476420affba90
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs, including suspicious domains like 'vilenefex.ru' and 'ses-paypal.com', suggest this document is designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded URLs points towards a phishing or malware distribution attack pattern.

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://vilenefex.ru/123?utm_term=integers+worksheet+grade+7+cbse PDF link annotation
    • http://ses-paypal.com/781209245543bt94.pdfIn PDF document text
    • http://doriwev.iblogger.org/23242691695.pdfIn PDF document text
    • http://zexitekaxob.mypressonline.com/gevezagikosasagogivig.pdfIn PDF document text
    • http://pro-gram.pro/lifasefudemejal8ln0d.pdfIn PDF document text
    • http://mishabelle.ru/penawobuxomuzede8jfl0.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/lymphedema_and_breast_cancer_questionnaire.pdfIn PDF document text
    • http://shishkin-seed.xyz/percy_jackson_3_moviesibceg.pdfIn PDF document text
    • http://mofonuf.medianewsonline.com/19878506770.pdfIn PDF document text
    • http://lesagotefawa.22web.org/loading_screen_mod_report_location.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/78206504264.pdfIn PDF document text
    • http://powojisanenod.iblogger.org/datobelivalo.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/boards_and_beyond_cardiology_slides.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b895899-17c7-4556-905f-0c270c78098a/what_does_put_on_the_full_armor_of_god_mean.pdfIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_d89e8f3ef77947d6bfc34f6ca9968f06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4305b236-160b-4599-a90d-8f1d4cbf642e/how_to_describe_the_sun_in_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031ce668-995d-4f64-bba0-a5d7115f78d6/14348779392.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_5198735db04441d5af5eb7e8af8ceda8.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_952c9b894aca4a99a21eea8545a2a5d7.pdf?index=trueIn PDF document text
    • http://wumevagijez.epizy.com/latale_w_treasure_hunter_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_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 5480 bytes
SHA-256: ad2dee560c45099fd0e1601ad6706632cdb312da38def5ef3a495862e5a294ba
font_01_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 11436 bytes
SHA-256: cb1c32a91603291159ed4f69c2e204e32adc3070c468af8f19fc2c8ab53e423e

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