Malicious PDF — malware analysis report

Static analysis result for SHA-256 367993978cc1911a…

MALICIOUS

PDF

67.1 KB Created: 2020-11-14 19:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 92d13a2c5b5c1a27ee62e3259b9886a4 SHA-1: 96f37b4a48f376b62562f3c5c4c19224dbfbca2e SHA-256: 367993978cc1911aeb40265f39410dc66efea9d132552f5a3574fe5e82aa646a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to resources that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://trafficel.ru/aws?utm_term=collocations+worksheets+for+grade+8 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5f9d2ae79a4a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f903e89cf4af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f9510916345f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_5f9eaa01874fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f89e4d9a173c.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/19022eab1e9be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f888ddc0ca62.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/jemazejodep/vexefiw.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/38723954149.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/fiwijopelesapijavilosig.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/delivering_happiness_by_tony_hsieh_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/tipard_to_word_converter_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/9938470704.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_off0000c966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC966 5536 bytes
SHA-256: 74643f7602b639715f5705cc47c55a0ede224ee81254f19d8ee5fbfb397b6338
font_01_sfnt_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 10288 bytes
SHA-256: 9a9706c699efe8f77e192c1d969b1010f2848bc7df73d98ccd64a850cea6311b

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