Malicious PDF — malware analysis report

Static analysis result for SHA-256 721624bcf1de3e78…

MALICIOUS

PDF

74.7 KB Created: 2021-03-25 22:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fe1d2aa2d31a7e52bf073e359dfd1528 SHA-1: 73fef016c9355b237b0625990d8b32190052363a SHA-256: 721624bcf1de3e781841aa80726a7219a47ed33977c141762c26ce92b5b18c96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://leonvi.ru/123?utm_term=lower+yuba+river+fly+fishing+report PDF link annotation
    • http://jowopejev.22web.org/31684645731.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/34456442341.pdfIn PDF document text
    • http://surivapofoja.iblogger.org/is_fifty_shades_of_grey_free_on_amazon_prime.pdfIn PDF document text
    • http://akmurzina.com/jodexasivowujazorc3hhb.pdfIn PDF document text
    • http://legalvictory.group/bebupipefigugv6zne.pdfIn PDF document text
    • http://wanuzib.22web.org/56134904339.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/harley_davidson_6.5_boombox_for_sale.pdfIn PDF document text
    • http://realwockyc.info/tomasg1n9v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://misosemarimo.rf.gd/maths_brain_teasers_year_6.pdfIn PDF document text
    • http://kagokonutuvep.epizy.com/green_day_songs_list.pdfIn PDF document text
    • http://zetijub.epizy.com/google_digital_marketing_course_final_exam_answers.pdfIn PDF document text
    • http://beliraguw.onlinewebshop.net/zezeselunenogiledaxaziwo.pdfIn PDF document text
    • http://rufegojokod.epizy.com/vlookup_two_sheets_excel_2010.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_f17ccb9003774c5486b510d9c8ff138f.pdf?index=trueIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_8048a259d1c046028b84789042d82045.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/96447174109.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/17611862300.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_f14acc8c1f324a60856d4b087c72ef1a.pdf?index=trueIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_a8b2df3d33d44eea9e4b2a8bd63cf6dc.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_563ffbfdc6334dacb809c67eec11a421.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 5500 bytes
SHA-256: 270317cb46726b1c75409714e8f29870fdf3a8c12ebbcd9f4df7ba511abc026e
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 10064 bytes
SHA-256: 5b343caa2ecd791afaf1b157804826789a756520caa1f0f14d0daaaf97d8ee71

Open this report in the interactive analyzer, or submit your own file for analysis.