Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde442ffac7b49d6…

MALICIOUS

PDF

73.2 KB Created: 2020-11-22 13:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 198806774e656b20bf83b1df5e7d9b2e SHA-1: 11956d48aa61be8b2a3889d569ae185785d193df SHA-256: cde442ffac7b49d68a76513b5e4eabb709bc76a182a8069e15b03d28b1f58ae8
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=who+invented+cotton+candy+and+why In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f88f400c0e4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_5fb91b5e0e590.pdfIn PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/refifosezux_kexefoxor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448735/normal_5fb759b327d37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479904/normal_5faa1a2e695c6.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/ce6cd9.pdfIn PDF document text
    • https://porimejonawi.weebly.com/uploads/1/3/4/3/134368737/5143008.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://s3.amazonaws.com/bopuxosavubare/xupevusunizegesosilogap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4708cbd3-1eb2-4777-8254-98be274f81d5/zigovi.pdfIn PDF document text
    • https://s3.amazonaws.com/kafifawono/best_gaming_laptop_black_friday_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/42750541338.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_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 4776 bytes
SHA-256: bb512dfd384ef2b3b54061f4f7351aac376fd747c9cdc540709cd733c064911b
font_01_sfnt_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 10880 bytes
SHA-256: 511d0a6575ed1ecd7d93d49cd7c335dc29190cc9748af71c2b81d089072fceac
font_02_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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