Malicious PDF — malware analysis report

Static analysis result for SHA-256 330b963973ea7cd3…

MALICIOUS

PDF

70.5 KB Created: 2021-04-05 12:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2b07c9f79b804bc0536d7949f9d8edfc SHA-1: 812281334bd76ad848ab7845235beeee5eadccc2 SHA-256: 330b963973ea7cd3c6d325aa7b2c9fb48e99571abe88ffdddfbca41166539727
186 Risk Score

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 0.9997

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=eisenhorn+omnibus+buy PDF link annotation
    • http://katermore.ru/67075640344edf2.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/374361.pdfIn PDF document text
    • http://damvglaz6.xyz/72741088173n8roo.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/146917.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/f02e2bf0b7609f.pdfIn PDF document text
    • https://fijogukovope.weebly.com/uploads/1/3/1/3/131379832/vuzap_zegawazufogorok_wanopa_winudu.pdfIn PDF document text
    • http://4escam-bot.online/cv_templates_free_word_document_pakistan7egnh.pdfIn PDF document text
    • http://creditscorefix.info/ariens_520_oil_changeh3qqi.pdfIn PDF document text
    • http://fullpisetc.ru/pertussis_fact_sheetghjnj.pdfIn PDF document text
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/4b3860e898b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_bb215eb0e63048529b956d4c49f55c9d.pdf?index=trueIn PDF document text
    • http://naxaroxabim.rf.gd/82907731617.pdfIn PDF document text
    • http://vajitefafuxuz.epizy.com/44602994134.pdfIn PDF document text
    • http://sawutex.rf.gd/convertidor_de_milesimas_de_pulgada_a_milimetros.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/is_thyme_difficult_to_grow.pdfIn PDF document text
    • http://puvodiga.rf.gd/statistical_analysis_with_excel_for_dummies_3rd_edition.pdfIn PDF document text
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_7cdcde161dfb4e2c8243d5411e97af3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixolose/83524049816.pdfIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_ee889b8a2e48466fae1d1bfa763a9a52.pdf?index=trueIn PDF document text
    • http://gukupexokopiwug.epizy.com/81794336634.pdfIn PDF document text
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_17273dd3d8c44b2999d93f71e36ee9bb.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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 4884 bytes
SHA-256: 1f8e15b1215644983ffb272add2affc20fe8cdd53964be5b415bafe954ee065e
font_01_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 10556 bytes
SHA-256: ad8fd363a7c5657a8de7b34d97c473bd59ba17d5570c00f0e7aea45d32f632f8

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