Malicious PDF — malware analysis report

Static analysis result for SHA-256 659d2b1b18c497b3…

MALICIOUS

PDF

60.1 KB Created: 2020-11-11 00:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9234d25b14e242c164b6b38df94f78ef SHA-1: 1166b00106516a2463ac8dca83b4756e4a4a94f1 SHA-256: 659d2b1b18c497b36bebf7cfa033d8680b488d65f63f7d910b585897a6f65202
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?keyword=fragment+and+run+on+sentences+worksheet+pdf PDF link annotation
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/fd0cfeca78027.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://lubebubekawi.weebly.com/uploads/1/3/4/7/134714091/zenukitep_xowofurewevup_suvuwuxul.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/dowipoximop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5f8f3a6159528.pdfIn PDF document text
    • https://tajekuludukomas.weebly.com/uploads/1/3/4/4/134498487/4339692.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/naramuro/dewikoxenasibubemojex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fecb28fd-6408-4f60-9ad2-8dd9b329120f/lotadip.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/38073598103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94534a94-76bf-4dd7-8427-53ac7428c05e/47839194337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950ce9e8-9dc4-4671-ab94-484a8e8a3f52/free_roblox_accounts.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_off0000aec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC6 5648 bytes
SHA-256: 03a33ed8a1464d079ff578c51c19a3945e89ca8ee6e59627a754dfe606122e83
font_01_sfnt_off0000c1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E9 9892 bytes
SHA-256: 60a1f0037c047f8fad2b6228cf233cb3ee8dc86ae3a33a33eac5693f71f4cded

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