Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b995bd55876f67…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 14:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 590cc4bcafa0a72c2a304795af9d208e SHA-1: e59c7b19a10cf53d9eb24d6784e6a13be3781002 SHA-256: 24b995bd55876f6753c907931fa7b3f06fb89a5ac6528fa03bdd2e32cd85d8a8
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. It contains numerous external URIs, with one prominent URL pointing to 'xezojetit.ru', suggesting it's part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is a link farm on disposable hosting, designed to redirect users to various sites.

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://xezojetit.ru/123?utm_term=curriculum+guide+in+science+grade+2 PDF link annotation
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/5520954.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/13163918420.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/gixunofuloxu.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/egdZibV/zedd_the_middle_live.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/ba7f7cb6.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/eQE7hdr/road_riot_tango_download.pdfIn PDF document text
    • https://cdn.sqhk.co/moxawitab/KTgf8nn/43402606346.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuzodopuvu/jxLUhey/carcinogens_in_food.pdfIn PDF document text
    • http://zabogena.iblogger.org/mit_google_maps_strecke_aufzeichnen.pdfIn PDF document text
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/zexubanez.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/gaxuremewuger/punjab_university_registration_challan_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/picket_fence_quilt_tutorial.pdfIn PDF document text
    • http://zoxejotemop.rf.gd/app_store_android_apk.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_dfbf70dfde8e41dbab25a5e3ddb1ddb1.pdf?index=trueIn PDF document text
    • http://femagela.myartsonline.com/81250342672.pdfIn PDF document text
    • http://jerovewoxisabu.epizy.com/29322342476.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/post_bsc_nursing_form_last_date.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/challenging_negative_automatic_thoughts_worksheet.pdfIn PDF document text
    • http://galakekev.rf.gd/83268583962.pdfIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_40612cb6eaf54df3ba18de07646867d2.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_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 5296 bytes
SHA-256: f741384cdea9ccfe5b28ed4016730cdc9418aedf0395f542e46d07ae5ba3cb22
font_01_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 11044 bytes
SHA-256: e7121f97e8c7e2dac1e432dcea3a86902955ffdda14e40c8b9a7aeaf71f1d83e

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