Malicious PDF — malware analysis report

Static analysis result for SHA-256 143c88cecec72cbd…

MALICIOUS

PDF

77.0 KB Created: 2021-04-17 21:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a1b299d493d2a91275e9796ab9d2e6d3 SHA-1: eeda2e8b9f86bd2d0eb2eff876527a176372669d SHA-256: 143c88cecec72cbde8b5dc9e5e17d39794ea1bc349adf130d353baa255e2d96b
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 0.9998

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=gnostic+teachings+books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449603/normal_606e67ada590d.pdfIn PDF document text
    • https://sirususi.weebly.com/uploads/1/3/1/4/131407567/namapezejegoxif.pdfIn PDF document text
    • https://fatuzolawodazu.weebly.com/uploads/1/3/4/7/134730183/d13fcb3dc6.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/lutewojotedaxarerikomule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_6044cd59aa26a.pdfIn PDF document text
    • https://sesuxaned.weebly.com/uploads/1/3/5/3/135349378/9de94f58f4d24c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ffe50f1bdb33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_603ea81d8f811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_5fd22123af5e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485446/normal_5ff37a2e76d7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_60303e88f20ce.pdfIn PDF document text
    • http://wejafopag.mypressonline.com/advanced_excel_2020_tutorial.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/012e7996-3e52-4621-9c1c-c1c553370491/fulagunenilikidana.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/wolf_oven_price_list.pdfIn PDF document text
    • http://wiloradakuno.onlinewebshop.net/33779005898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e85509-c3a3-4405-a3ab-29f2230f67bc/myers_briggs_personality_test_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/absolver_faejin_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd162511-1935-40bc-9de0-9af98510e1a1/short_film_scripts_on_drug_addiction.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/are_we_slicing_the_pie_correctly.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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5168 bytes
SHA-256: a994c356e95308f5a6ca01f071447a8ac5fc20693f460ca6981b59f3ede814d1
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 11820 bytes
SHA-256: 260312cf45107f23d8409aafa519fa668d208e77a8925b26d441762ce0f6f8db

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