Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a44bd6054bcdab…

MALICIOUS

PDF

74.9 KB Created: 2021-04-11 19:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 433be1831c9c7289cdee9888b8b4dc91 SHA-1: 69cea68aa44cf475a63c0babdecc0f1e2886a3c5 SHA-256: 63a44bd6054bcdab421449324c8d6b3dffce211d281183c17700ae7533582609
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'audiobook mp3 download free', indicating a lure for users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=the+rational+male+audiobook+mp3+download+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416504/normal_601f37fe2a9e6.pdfIn PDF document text
    • http://poroda.site/lijiwomowexavegi700s8.pdfIn PDF document text
    • http://hookup153.fun/95184619134jl66a.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/ieKhbt6/whatsapp_video_status_download_sad_punjabi.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/woxemij.pdfIn PDF document text
    • http://kinorio5.xyz/49794632411fqq8c.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/bjhhhgd/16413889560.pdfIn PDF document text
    • http://meetsoda.pro/godosatawanuzimasiwomixapr6x6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_603eb1e24dfb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_604497b493ec4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5fe1beeb3ab77.pdfIn PDF document text
    • http://fitness-ital.fun/137833912077pe8p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5fdc84a61f377.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/beamer_tutorial_latex.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/wXFqgfI/password_list_generator_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojanesifilagu.myartsonline.com/why_is_my_wii_motion_sensor_not_working.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/latex_beamer_import.pdfIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_e3af53b3f31a43f6ac9afe052e334196.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_0d9c3b53259440bb9c00dd32d6bd9b29.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_a480d4e0737248819b59445cabfef34e.pdf?index=trueIn PDF document text
    • http://tososite.onlinewebshop.net/28755633111.pdfIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_af6f357113bf4d0cb008cfe0fac147fb.pdf?index=trueIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_f8dade9768644adbbffa2f18f8b15c13.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_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 5512 bytes
SHA-256: 631aeca1079f52a1481ad1ff3ed1905307fd0e66424619baaea3323b8bdc1425
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 10436 bytes
SHA-256: 1502f487413599d3ba1f2e83cf71798886e5bb563077b3f4bcec2777bad48902

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