Malicious PDF — malware analysis report

Static analysis result for SHA-256 286e972cb5cd81f2…

MALICIOUS

PDF

79.8 KB Created: 2020-11-14 00:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2ed472291a1ffb07cd5e595eea02455f SHA-1: ddd891e1b8fc88e9ebe62b75431fd440c453c607 SHA-256: 286e972cb5cd81f2dad32680acf24e30766ac48e94c5a4a321cfad102fcd22e0
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 as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful sites. The presence of an embedded URL and the ML classifier's high confidence score further support this assessment. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=cuny+summer+corps+internships PDF link annotation
    • https://xirofepomare.weebly.com/uploads/1/3/0/8/130814083/xuwojowepivitu_fosebeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5f92686184965.pdfIn PDF document text
    • https://lekinowi.weebly.com/uploads/1/3/4/4/134476644/vobupiku.pdfIn PDF document text
    • https://vuvopovakufusoz.weebly.com/uploads/1/3/4/3/134342968/xirowugaziwinojas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_5f9c4fda3e3a9.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/perurulexi/1901483246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9236a951-e350-4b5b-8720-8757b9688df3/89551144206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d16cf5-7d28-4515-925e-c3ff2baa3545/12881451551.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/flamingo_kero_kero_bonito_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/sunibiseriwomogiveb.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/kifiwaxizolisud.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/vaapi_vs_vdpau.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/socket_head_cap_screw_dimensions.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_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 4940 bytes
SHA-256: 5237911391bc4b71f45da4a560ce8ec97b1547912a2648484923ac7a739f5197
font_01_sfnt_off00010ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 10484 bytes
SHA-256: 288ad8c48cea78f8b9aa9785438c1c9d97eb9db2c365c3bd45951592e7722ccf

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