Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50d6f2a9fc2079b…

MALICIOUS

PDF

84.2 KB Created: 2021-04-03 11:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 86eba2126b1649f0fbfed37db9d78707 SHA-1: b01137844835b2cb8d3d6c0d5591e91819910d70 SHA-256: b50d6f2a9fc2079ba497c30f82841c144bec8ceca1713baccc8bbcfcc3e7faea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://bologen.ru/wix?keyword=rsa+conference+2020+hotels PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384295/normal_600e8d5104433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491933/normal_603e29a4d716f.pdfIn PDF document text
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/lekukuxusa.pdfIn PDF document text
    • https://cdn.sqhk.co/takodabu/ighaRF4/86688009396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_60168d21ebed7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_60608bc5a120b.pdfIn PDF document text
    • https://cdn.sqhk.co/resasenubori/5UBjjhc/parkour_go_2_unblocked.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/9179200.pdfIn PDF document text
    • https://pitulero.weebly.com/uploads/1/3/2/6/132683003/651496.pdfIn PDF document text
    • https://rusizatigaj.weebly.com/uploads/1/3/4/0/134041601/a84b37.pdfIn PDF document text
    • http://tipijijajofupi.sportsontheweb.net/approaches_to_curriculum_design.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5fec7bad0c6a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389830/normal_603b531f84d29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_600b2bfc22b07.pdfIn PDF document text
    • http://kejumazinanu.mywebcommunity.org/xevemufixovunaso.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/dRjd2s0/axe_clicker_hack.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/ab960681-3ab5-4a58-81e0-25aca4eac017/40738251343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6880d7ca-4588-460e-b744-f54b62702269/how_to_adjust_belt_tension_on_ariens_snowblower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d23d5aa2-be28-4d5d-89be-1cd488a6e90a/how_do_you_describe_percy_jackson.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/equilid_50_bula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2f6bb4-af04-4598-8a3e-e3430f04bba4/hp_z420_workstation_technical_specifications.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_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 5248 bytes
SHA-256: 08b799b0185ad339cfb874a0499a482d9269ad7acca55b6fc06951252a6e62ac
font_01_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 12260 bytes
SHA-256: 115637fddfaaee6f77e79060b9961590b40065e2bb72a2873bee16daa1013299

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