Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e63b949a5f2d90…

MALICIOUS

PDF

97.8 KB Created: 2021-03-23 15:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c519ca695134c5742e2b6222f2d6546 SHA-1: 799b1751c26132196356368f0b35edf1b06af651 SHA-256: 03e63b949a5f2d90c617f75ebb4de70b4f65cb163a8666b6e5418b03e6512e44
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself, combined with the heuristic firings, point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://resalured.ru/wix?keyword=peter+pan+script+pdf
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/10044601.pdf
    • http://driveformclanemilwaukee.com/114955439704gh4e.pdf
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/namat_mesukopipawadip_gesesisibuzoto_buvur.pdf
    • http://opensalle.xyz/kyocera_error_1102_windows_10mg7pl.pdf
    • https://lipodemofuxe.weebly.com/uploads/1/3/5/3/135316225/nenewikegisexi.pdf
    • http://good-production9.site/principles_of_design_contrast_examplefe7vl.pdf
    • http://connexion-amelii.xyz/asterix_and_obelix_the_golden_book6z45b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92df580f-a4c0-435f-ab66-2665469bafae/pierce_college_english_101_syllabus.pdf
    • https://uploads.strikinglycdn.com/files/ef550520-0b02-4fb9-9beb-9470c7c2486b/international_4300_turbo_actuator.pdf
    • https://uploads.strikinglycdn.com/files/db06ade4-f04b-4d38-8e02-52a7c3b71f7a/formato_de_mantenimiento_preventivo_y_correctivo_de_aires_acondicionados.pdf
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_5fcdae1961c5497b840f0df8b3528fcb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3d29b3ed-5c78-4bb3-b763-8ad2d62860fd/gawus.pdf
    • https://uploads.strikinglycdn.com/files/5d11a879-f1c6-4fe1-b961-71cf48d0fa0e/7202694994.pdf
    • https://uploads.strikinglycdn.com/files/0493f4f0-65d6-46cd-a6c8-4bd84aa44877/which_interior_design_course_is_best.pdf
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_2d1bdcffe1dc4d27b108a8963152884d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bb7cf387-c832-4cb5-8139-028f06b246fc/how_do_i_troubleshoot_my_modem.pdf
    • https://uploads.strikinglycdn.com/files/77d52838-ed33-4983-859e-366230142155/39098300219.pdf
    • https://uploads.strikinglycdn.com/files/e8f7f283-882c-43c2-9c9e-207a9d9801e8/tavupewitejogeluxoferow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145c7.bin
6646e3d1d3e1c85e4162b65aae5e0e490028c60f44bdae063b968a0662d1ee33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145C7 5116 bytes
font_01_sfnt_off0001573a.bin
ddcefc171e35454808587e2ef9eba76472676f881d96a960d3c1bd6d443a41a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1573A 10284 bytes

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