Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d9fc5a897a4737…

MALICIOUS

PDF

113.6 KB Created: 2021-01-10 03:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ffb141ce7e6949a285e0be3451f5fadd SHA-1: b27405f5304516ab3d042b30a909bc91d523bde2 SHA-256: 33d9fc5a897a47377a9b21b53f6e08454fc876c2df0ded2e08e668092034fe02
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious activity, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=co+form+104ad+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385887/normal_5f916f99ee237.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/e95663c62b39.pdfIn PDF document text
    • https://jefifekelu.weebly.com/uploads/1/3/4/7/134744422/bedifinonapole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_5f91446af2189.pdfIn PDF document text
    • https://tafibukazun.weebly.com/uploads/1/3/5/4/135400045/83d77cf8.pdfIn PDF document text
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/49f2d.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/lasovuminoda_liwupuxisoduxip.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/lixisariwulo/8628254346.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/food_vocabulary_esl_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/wunerasanenaxux.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/manabekivuwenaxujujo.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/violin_practice_chart_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/rujarokobabagi.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_off0001821d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1821D 5320 bytes
SHA-256: 33e27390d046fa9e4b2100a205c831f924fcd6d6874d4e6168312cdba0ed5ee1
font_01_sfnt_off00019425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19425 10780 bytes
SHA-256: bc0b21da4996ef451164a3fae3183259bf9772e98649317aedbfa65640192ece

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