Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33b9ed5ba8f242c…

MALICIOUS

PDF

73.9 KB Created: 2020-11-19 06:35:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b067d2ff4f4537469fa33f2dec1d0ac5 SHA-1: b7bd39502ec5dea04f9601b452deaba2c3e7c78b SHA-256: b33b9ed5ba8f242c9f0cbac3f8032a407a75738dce48815ab4c625c8fe02fb56
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=%25C4%258De%25C5%25A1tina+pro+cizince+pdf+b2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f8a5e7fe717f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5fa60587913dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_5f9247438cc96.pdfIn PDF document text
    • https://kavaxaxogemiren.weebly.com/uploads/1/3/4/4/134441995/6144724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/153ef8e9-e0e9-465a-91fe-22b9ada54645/45534286724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7e785e-877c-401d-aa7b-02c072dc0df5/18755905186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685990f0-de95-4dee-93c5-930f600c748a/waxonanolapakufezis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da5f6d9-1465-447d-b778-beed29f70cad/dupaxupoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73db33f8-1d3a-4e41-b005-0b52887894b2/carbon_monoxide_detector_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f11c700a-cf8e-4ed4-8a78-ab4e1ade3573/writing_ionic_compounds_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cadea465-3793-4b79-91da-06645821afaf/osrs_smithing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08405b7-2a6d-4c8f-beef-a7524db0fd6a/ase_test_dates_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e194f6f-4991-4c51-9436-cd95e56ec01f/sonupubexapetole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e18036-4335-4b2b-a36f-0915d1db74e7/74476257031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a50f5de-f83f-44ec-bb9c-a4952aa4403a/cagney_and_lacey_cast_change.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 5312 bytes
SHA-256: ee99b18db657de36eb03b757e1769bcceb00368193a3b707ced178f0e8710487
font_01_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 14544 bytes
SHA-256: e506fbed7c6d52880d38e53b36795e41ec68efc1d0a6798c30f8878f26acd259
font_02_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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