Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5aa560424dbc92…

MALICIOUS

PDF

74.6 KB Created: 2021-03-17 08:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 78a50e32b608809a5ada68c863f5e5a8 SHA-1: 34fa790efc653def1bf7c76cfad73dc7efd9aa12 SHA-256: 4b5aa560424dbc92495ef56845f2c173d75726895fc30f0d0624439c1d60f41e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/wix?keyword=plant+and+animal+cells+worksheet+answers PDF link annotation
    • http://generalmassage.online/dimanolikalevfh1h.pdfIn PDF document text
    • http://pasozabijegigus.iblogger.org/basic_shapes_free_worksheets.pdfIn PDF document text
    • http://kalulib.iblogger.org/kovojodiluwalevi.pdfIn PDF document text
    • http://razvivatel.blog/jojirojisupagefofasaw3wl4o.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/average_salary_for_graphic_designer_in_chicago.pdfIn PDF document text
    • http://apkweb.net/4776132685589dnb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_9ef73982adfc4fa6af8f62fb98d9874f.pdf?index=trueIn PDF document text
    • http://nofegogimulat.rf.gd/97419574313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcf836d-e4bd-4007-ba28-8df93406799b/lidilubemakoduraror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97dee469-6e74-48ed-9446-f3a295d1b12d/how_long_is_maternity_leave_in_the_philippines_2019.pdfIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/32242290631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3c737e-81ec-48a9-b747-8de5499d4ca0/tubelesubexojokazup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8243ae91-1c7f-4753-931b-d420990134a3/why_is_there_no_sound_from_dvd_player.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_ddd00a29d5b54915910f1cec423c7ebd.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_978ff1b3b22a41199c2233a7f9be116a.pdf?index=trueIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_0bb64e9a48004a2c997d985f508b07ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4bf582-8891-4eb3-ac14-40489c23b539/10158357233.pdfIn PDF document text
    • http://lugimeviguv.myartsonline.com/lepebixazilud.pdfIn PDF document text
    • http://nokivegodixisi.rf.gd/bollywood_movies_2017_hd_mp4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 5336 bytes
SHA-256: 2a0fee8fbeede1424a720e88e8d8f9b13f3bb521ddc9d50f3c5badebf08c9f47
font_01_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 10280 bytes
SHA-256: ba2d5ff92e40a1f07703e3e6a3eba31bb0e6835399ee267f06f2a193fdfef503

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