Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de92186b0b892bd…

MALICIOUS

PDF

66.9 KB Created: 2021-02-13 22:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b2396228c67f8fd86554746d438412e0 SHA-1: 0b674749d270a20ddb4d60f8f2e57a7d172d18a7 SHA-256: 4de92186b0b892bd073515615870a77b5a5baba0f2f07b0f3fabbd9bcfb3e73f
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/wb?keyword=barong%20bali%20vector PDF link annotation
    • https://walipovagotil.weebly.com/uploads/1/3/6/0/136016519/kejejeduzab.pdfIn PDF document text
    • https://rikinosi.weebly.com/uploads/1/3/4/3/134352476/pajizulibet_xobalomuparum_dazak_buxoz.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/jhi4DiA/free_games_new_2019_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/gcieQhh/97443584608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401555/normal_5fc6c92722274.pdfIn PDF document text
    • https://vedatirujoxe.weebly.com/uploads/1/3/1/6/131606280/luxajosovutajotu.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/g2HQidl/3854429907.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/Tjigegf/top_40_radio_pop.pdfIn PDF document text
    • http://power-guard.shop/sql_developer_export_date_format_excelgrv9y.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/gjbgerY/60710140456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472501/normal_5fe6aef0bbf66.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/EsPhfif/gapexedorizawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_60109d9038307.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/gummy_bear_experiment_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/icbp_annual_report_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/askep_pneumonia_pada_bayi.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/tuleda.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/broadsheet_brisbane_hotels.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC031 4824 bytes
SHA-256: 1c1a8b090db95eea862490c20fcbd3d92330ec1b3ff2e2521dfc442804d0dbad
font_01_sfnt_off0000d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A9 9344 bytes
SHA-256: db6e33c5049a9d1a1f0af3701cdf5c5bc8147b2abc105eb10e5bebc5e2ee79e5
font_02_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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