Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e25173cc0ce716e…

MALICIOUS

PDF

88.3 KB Created: 2021-03-11 00:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: edabb948d7f7de3fe1e67f2cf884493f SHA-1: cd5b4b8bd60cc2960cdc13df4fb5a8a8d1f199e1 SHA-256: 6e25173cc0ce716eae22e43dce2167117dbfb02a6b4717b0dc6c1c997d387cc0
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, with a primary focus on 'xezojetit.ru', which is flagged as a link farm on disposable hosting. The document body, though partially corrupted, suggests a lure related to 'IELTS test answer', indicating a phishing or social engineering attempt. No scripts were extracted, but the PDF structure and embedded URIs point towards malicious intent.

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://xezojetit.ru/123?utm_term=a+chronicle+of+timekeeping+ielts+test+answer PDF link annotation
    • http://fupuwage.22web.org/calendar_excel_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_603c787a9f977.pdfIn PDF document text
    • http://wukivobezoba.iblogger.org/staar_released_test_2016_algebra_1.pdfIn PDF document text
    • http://waxokuvinati.iblogger.org/machine_vision_report.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/what_is_audacity_definition.pdfIn PDF document text
    • http://nerazegizetikam.getenjoyment.net/xoxakidavubago.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380380/normal_5fca41d3f1975.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/beden_dili_hareketleri.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/walomesedajiramabeniwewev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_c2b3ad82ed564d0c9a2beb52654a9d18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/how_to_hard_reset_a_kindle_fire_tablet.pdfIn PDF document text
    • http://jopuzasoxu.rf.gd/ask_the_dust_book_review.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_9af9db43997945608ab996e294ff5443.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/cebuano_christian_songs.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_e587bfff710740fca16c364beca4a9bf.pdf?index=trueIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_a5ecf9ac4a3a4f9d856be7448a854cdc.pdf?index=trueIn PDF document text
    • http://palakojum.rf.gd/lufemudowononono.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_aadd28a564844b57904cf9facf78c62b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/business_model_canvas_excel.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/67985873446.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/14010903146.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 5364 bytes
SHA-256: 4bc11e0524d534d9b8648cf1f21adc3a82b1aa8bac39f26dd8bd56edc4950e3f
font_01_sfnt_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 10676 bytes
SHA-256: a2b1937914d9ed6f9e1400576aa52581a264a165f163168b0cc1fb63338e8de9
font_02_sfnt_off000144d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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