Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c3cc8462f89dcf…

MALICIOUS

PDF

69.4 KB Created: 2021-02-10 18:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 34b725e5830b20849c47a3c63232b41a SHA-1: 67210b23729f25bfd17ff7534227bcb5e5e51d72 SHA-256: 74c3cc8462f89dcf30da396d22784ac6843b082fe9cb11e927429f44a172f240
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/aws?utm_term=leatherwork+merit+badge+worksheet+pdf PDF link annotation
    • https://xipidutaz.weebly.com/uploads/1/3/4/4/134401361/4541534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377647/normal_60068eba458ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380379/normal_5fff11b55e90e.pdfIn PDF document text
    • https://wobifezoredeju.weebly.com/uploads/1/3/5/3/135323063/8000422.pdfIn PDF document text
    • http://zexawil.22web.org/football_jersey_design_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_5fd2853f7b380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5fd664c2f28cc.pdfIn PDF document text
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/kefosavelabifadi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kufazete/free_psd_billboard_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/jemepixatuxoxodufusoga.pdfIn PDF document text
    • http://wubexemetaxoru.epizy.com/aalco_aluminium_data_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/24249484198.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/guided_reading_level_e_chapter_books.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/canine_anaplasmosis.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_off0000d220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD220 5660 bytes
SHA-256: 0a90f0516351a7457dd0247c72c6884b8e1a062c87e6ce15868ebbf714e55eb0
font_01_sfnt_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 10456 bytes
SHA-256: 86df9c0aecdcfb613bd4d9e937579f40b2eac8a0218c5178c181385e8bebc7eb

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