Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2c8d60d09e8445…

MALICIOUS

PDF

73.8 KB Created: 2020-11-27 05:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 59f0451237100121dd919035f4c059a6 SHA-1: d9dd3973dca4e4c41550cd11cf44ed3d07f77fcb SHA-256: 0a2c8d60d09e8445f3173cb20a0aaa2b542acce4d89ef6b0563ab3a9fb988a93
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffe.ru/strik?utm_term=rappahannock+county+public+schools+jobs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5fba4e5d5e921.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/roruj-fegedevovelere-zexomojikazi-rewubujelem.pdfIn PDF document text
    • https://bavibexovapow.weebly.com/uploads/1/3/4/6/134643610/mikopikaduzofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f9c3dde77f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_5fa82d51c2068.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/digebanoretedolik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f8e43c1b2388.pdfIn PDF document text
    • https://juwatupajevofa.weebly.com/uploads/1/3/4/7/134705275/kopibu.pdfIn PDF document text
    • https://derutibedevore.weebly.com/uploads/1/3/4/3/134354066/kuwudufemus_sotanupidumut_gisalatewabir_zowugezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4864348-fcf8-4e41-ba23-687590836be1/uk_bank_holidays_2020_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84646eb5-7559-44cc-b4e3-1a02ddee193c/butanesoraxaparesor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f92bed1-41de-483c-8102-b3e534345dd3/dilalopolow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62225f5-3dfa-4c4b-bffb-f2432dce740c/ludubelovidizidogoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0e4356-cead-413c-b50a-f21e0db62c07/wubelab.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_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 5316 bytes
SHA-256: a27b614c9a82ba0ad2582d2ef0ea5ffed13d4a00d8d2efb8551554f47136bef1
font_01_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 10544 bytes
SHA-256: 86853617cbfea580bb3885cd5f2f396a32ac882f3fe8d515da4016e945362c36

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