Malicious PDF — malware analysis report

Static analysis result for SHA-256 b597cccd58b7f4b8…

MALICIOUS

PDF

79.0 KB Created: 2021-04-05 10:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eaf75ac4dc19e71ab5fa2f969ed0f792 SHA-1: 572066e2de7afc90dccb96efe70f1b6f721cdb8b SHA-256: b597cccd58b7f4b80ba72d20ba5adcf7c4e859c2b2210fd51a1902091b3a4cfc
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 0.9996

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://vilenefex.ru/wix?keyword=steam+redeem+code+list PDF link annotation
    • http://mjawebdesign.net/93870936341mvmwd.pdfIn PDF document text
    • https://niladituzisum.weebly.com/uploads/1/3/4/7/134736231/tatojo_xusimokimaxov_lirazuxifupir.pdfIn PDF document text
    • https://fuwewarudizikip.weebly.com/uploads/1/3/4/6/134644733/zovepiweli.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/yifgjjb/44992973776.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/hgsRhcp/bloons_td_6_mod_download_pc.pdfIn PDF document text
    • http://good-production17.site/467415930411of5k.pdfIn PDF document text
    • https://xiligori.weebly.com/uploads/1/3/1/4/131411896/xilesepidavo.pdfIn PDF document text
    • http://wonder-ita.fun/lg_4g_lte_price_in_bangladeshae9xp.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/xihhegq/879553643.pdfIn PDF document text
    • http://talipavaponine.iblogger.org/rattlesnake_meaning_in_telugu.pdfIn PDF document text
    • https://zafolixoniwalo.weebly.com/uploads/1/3/5/9/135958226/7772110.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/8302813.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_c5266d9838f845c9808a1d992e3b30bc.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_c60c6bf4ce954d09a3fe010bd27f5669.pdf?index=trueIn PDF document text
    • http://tefalim.rf.gd/losufifurureninametipekan.pdfIn PDF document text
    • http://japumuvepabez.rf.gd/annabac_2020.pdfIn PDF document text
    • http://bexumasifawej.epizy.com/tavujuwodenadudeporulu.pdfIn PDF document text
    • http://wiwugaku.epizy.com/cara_membuat_carousel_di_android_studio.pdfIn PDF document text
    • http://rafesule.rf.gd/a_seasonal_pattern_in_time_series_data_is_evident_when_the_level_of_the_variable.pdfIn PDF document text
    • http://sagowef.rf.gd/zobakerawuze.pdfIn PDF document text
    • http://rizokimom.epizy.com/active_listening_meaning_in_tamil.pdfIn PDF document text
    • http://fafalibowadavuz.rf.gd/stakeholder_relationship_diagram_template.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_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 5188 bytes
SHA-256: 21560f4d038dc7bf9042e2f343fdbe034c3ee4276f759112b6388b8a2d226bc4
font_01_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 10536 bytes
SHA-256: 5c128755e779353836c890100f20e573f692c98e8f677b83e14493629d845b79

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