Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff5e85f28c4af34…

MALICIOUS

PDF

65.9 KB Created: 2020-12-06 15:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b02dae20b1b2f936546495835b7bdc54 SHA-1: ef84d62ae5ccbd32181c50dd508af5dbb184ea5c SHA-256: 6ff5e85f28c4af345cc01b84e8b3cd06e4f771e26fcc8e01e59b55bbe5394bf3
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/123?utm_term=7th+grade+math+guided+notes+pdf PDF link annotation
    • https://firaxefa.weebly.com/uploads/1/3/4/6/134694685/mopepuketig-pugujaniziki-wovuj.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/3724790.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/252ed2317612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_5fb73d9f8e9ce.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/3284852.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/fukakix_lobonagoke_voxajutafetufos_xujimozoxivid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_5f93bdfba295c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454679/normal_5fbdcb049bc07.pdfIn PDF document text
    • https://seporulakokifo.weebly.com/uploads/1/3/4/5/134590723/2103235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5fb92459ad0e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_5fa6f85e3dbfc.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/3432324.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/tokafanawa/gifuduvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297148f4-63ad-49ba-bd2d-1cdf1b0b18d3/clear_drive_map_statistics_hdd_regen.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_off0000c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 5408 bytes
SHA-256: 8720aeb054eb2ea2af5b571678ff3a58d63cc72dad2f6abc84ad4b8cb7ed8198
font_01_sfnt_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 10856 bytes
SHA-256: 88135b55fd79ef4163aa45aa2c2b5835fcb8d562734c100634aff4b10ca8be70

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