Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ede6c07dd448ce…

MALICIOUS

PDF

95.4 KB Created: 2021-02-19 22:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9ed22060a34adddc22c67b05d890d613 SHA-1: 38201642faf7ca28e9f500fe7bf4936588749b32 SHA-256: 63ede6c07dd448ce281469221e9b5bad1c9cd5c8276f627d821d93ec9ccdd7b3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate academic or informational content. The primary URL, 'https://bologen.ru/123?utm_term=how+do+you+cite+a+book+in+harvard+style', is presented as a guide, but the heuristic 'PDF_SEO_LINK_FARM' indicates a mass of links, suggesting a malicious intent to drive traffic to potentially harmful sites. While no scripts were directly extracted, the PDF structure and extensive external linking are indicative of a phishing or content-luring attack.

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://bologen.ru/123?utm_term=how+do+you+cite+a+book+in+harvard+style PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491173/normal_6003e6fb292f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393499/normal_5fec1381524d1.pdfIn PDF document text
    • https://totofogekof.weebly.com/uploads/1/3/5/3/135327731/gawezolozifofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_5fd76c0594534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383136/normal_5febb298061ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5fe59c4ad9ed4.pdfIn PDF document text
    • https://watilokid.weebly.com/uploads/1/3/1/8/131856522/wodasituduzupetew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485569/normal_601835d1a8b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_601612fb459c0.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/17e0f051a041be9.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/xejefolese-xunazejipar-bisetepo-sapiro.pdfIn PDF document text
    • https://gajamonorafu.weebly.com/uploads/1/3/5/3/135389334/3916002.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/jebokizez/82229413505.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/material_safety_data_sheet_silica_sand.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/vsco_full_pack_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/socialismo_vs_comunismo.pdfIn PDF document text
    • http://dupetomumipur.rf.gd/51412340435.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013f21.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F21 26412 bytes
SHA-256: 1cf53e808070f9ed64d897ad9d93e8bf965ece93f8f7d334dcf98e9145d8aa23
font_00_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 5448 bytes
SHA-256: de21b7ea35e76e29b6f2efbf957ee5e869f799d25029c3d3dc03cfe46ad0adfc
font_01_sfnt_off00011a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A38 10720 bytes
SHA-256: 17a7cdfaa86576116931f1645656f461adf8ad77766576df9912a045534d9301

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