Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf79766609594522…

MALICIOUS

PDF

69.2 KB Created: 2021-02-14 12:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1c81827c3d47711b3704318c0146d89e SHA-1: 522525e1ec30e4e19f9689347d07f65ca82feee7 SHA-256: bf797666095945229908da854610b31be2289a36accb3ca7950dbcd03fa5edbb
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 are hosted on dynamic DNS services or file-sharing platforms, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

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=avery+shipping+label+template+6+per+sheet PDF link annotation
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/neladotolodutol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409403/normal_6012edc95f6e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482648/normal_5fcc1368a4edb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368495/normal_5ff8cd8cae9fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387037/normal_5fe5bf754c22d.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/9140718.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413243/normal_5fdf460ee04d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_6027d6c459c40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5ff905d8dbcbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5fcc51830e6ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470837/normal_5ffc85bad65ee.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/serogajugomiji/67291562034.pdfIn PDF document text
    • http://donosusiligid.rf.gd/pimuzizixotujok.pdfIn PDF document text
    • http://zorufuzelal.rf.gd/linkedin_cover_photo_template.pdfIn PDF document text
    • http://mokuzamiwebifet.epizy.com/grammar_worksheets_on_comparative_and_superlative_adjectives.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_off0000d27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27E 5680 bytes
SHA-256: 7d8a849d4a90799a9912e68e6eede1165243a85f28e2843b20aa38866259180f
font_01_sfnt_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 9964 bytes
SHA-256: 937279207ef721b7924d52f4c7283b8c09ac4a96c844970133895befbb9d0df9

Open this report in the interactive analyzer, or submit your own file for analysis.