Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b88ee7a1277b479…

MALICIOUS

PDF

97.5 KB Created: 2021-04-19 23:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ebccc84c25660a496d192cb324cb873b SHA-1: e021b04d875613885484b5a8103271bfeb699f4b SHA-256: 4b88ee7a1277b479ee44b51db54e81e512ec30f46e86e5a4d4aa1befcca7d951
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('xajibur.ru' and 'nutesane.iblogger.org'). The PDF structure and embedded content suggest it's designed to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=little+fires+everywhere+synopsis+episode+7 PDF link annotation
    • http://nutesane.iblogger.org/vomanesosisoperuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_603edab7ae5b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_604daefced01e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_604e546800c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_6039f4de42db7.pdfIn PDF document text
    • http://mumaposogataj.22web.org/la_biologie_marine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471959/normal_600c9a6aed953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_604d9503dbe7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_606034b8a7edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_602623849f089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484994/normal_5fecc2a73e476.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/wonumafubij/jopuvakemos.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/ikea_malm_bed_frame_second_hand.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/desizavek.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/5909410639.pdfIn PDF document text
    • http://wofavum.myartsonline.com/maths_probability_formulas.pdfIn PDF document text
    • http://lejujafaroxe.rf.gd/xubexirapapamutokutanor.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/garmin_2589_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/value_proposition_canvas_template_ppt.pdfIn PDF document text
    • http://feduvuduselus.epizy.com/32906892563.pdfIn PDF document text
    • http://pulawev.epizy.com/horstmann_centaurstat_7_manual.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/52631951752.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_off00013d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D51 5192 bytes
SHA-256: ad88971680bfe2b58e67056d51489d7f6ef5b4b7fa26ef230c304467f59ae98b
font_01_sfnt_off00014f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F21 11620 bytes
SHA-256: 9f97989c8c802c262c7d8b15529dd3cdcb3e0b311d3e94327acbfe560ecc805e

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