Malicious PDF — malware analysis report

Static analysis result for SHA-256 0265a41fe5c697f4…

MALICIOUS

PDF

78.2 KB Created: 2021-03-10 02:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 57f68941547c3dbe79936bfe4668b59b SHA-1: d0e242e9bb73723b37f2dbed5a346976049b1a4d SHA-256: 0265a41fe5c697f48ed1146f30c86e6ddb7f149f999ff105de2cf8f1c91c729a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URIs, with a heuristic indicating it's a link farm on disposable hosting. The primary malicious indicators are the external URIs pointing to suspicious domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://gimoguvi.ru/strik?utm_term=is+the+blood+hunter+class+good PDF link annotation
    • http://beamorem.com/google_street_maps_ukfreff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5fc73289cabbc.pdfIn PDF document text
    • http://pedrons.space/renikolivaaggzs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_603000e40d9fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_5fe80c3ff050b.pdfIn PDF document text
    • http://meetchat.space/edit_super_slow_mo_s10yvxdg.pdfIn PDF document text
    • http://trelon.fun/pibuwijesejijolafu7ips6.pdfIn PDF document text
    • http://menetufebev.22web.org/xesape.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://uploads.strikinglycdn.com/files/a53f0d66-3fbf-4237-84c8-c8ca7ce4df48/niliruparufudu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/disgraced_ayad_akhtar_themes.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/wibebimabobaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7cbe36-81d2-44ba-8e38-ff7f91ef37b6/85091676373.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/45610772509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d7499d-3999-444c-9976-8461c9424ec6/how_to_analysis_survey_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5956e03-a16d-4202-9816-058064cf38b5/sql_server_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b6bc26-800d-4079-985c-7ac31803f511/78788156674.pdfIn PDF document text
    • http://garapaf.epizy.com/arduino_mega_2560_datasheet_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddba4896-4b49-40df-a905-f30dd73db41d/doerr_emerson_electric_motor_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/losenujosoweta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec41357-f0c1-4a8d-a47b-4bfc6edef470/76998240298.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_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 5112 bytes
SHA-256: b1250b7ababbfcd76d96f13c128f404811e0815a10291a8d5f898777cee0dc10
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 11108 bytes
SHA-256: 35efbed1b04d03e54aabc585df611f6c42b7a1be37ce28d4d5e0a6190fdb0392
font_02_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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