Malicious PDF — malware analysis report

Static analysis result for SHA-256 478d0341e38660a9…

MALICIOUS

PDF

74.7 KB Created: 2021-03-18 09:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4d85967716085e93011b3510062c0e14 SHA-1: 5d9e1d0e46691ca31bb0dc12d1f07c0437ac2959 SHA-256: 478d0341e38660a9b52cf554d3e23d60fd18a89c4606a22c671f5ce0e5ec9e52
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://dafemum.ru/123?utm_term=scripps+spelling+bee+2020+word+list+pdf PDF link annotation
    • https://cdn.sqhk.co/kososojog/hdDvhix/39708429001.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/S1SDhaM/patadenotegosafojakajarar.pdfIn PDF document text
    • http://gbarb.me/vatomx5z9m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_6032df3aea501.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/chdhbhf/demonology_books_free_download.pdfIn PDF document text
    • http://maritimog.medianewsonline.com/34393672798.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/tiwetaza.pdfIn PDF document text
    • http://evromotors.net/tesla_model_3_price_rise_uknw1f6.pdfIn PDF document text
    • http://all-casino.xyz/decision_tree_algorithm_in_machine_learning_tutorialk5gj8.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/rejarivozixi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412758/normal_60075fce5f405.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/gEgSid6/wumuma.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/65334683760.pdfIn PDF document text
    • http://liketime.online/95020753076pzja1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_0ae6732d92404fb0ace5fc4eff010fbb.pdf?index=trueIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_f5f33a39a5524b3f9c74b1868b847092.pdf?index=trueIn PDF document text
    • https://d0570615-6cc6-4b78-9a9c-590639bc525b.filesusr.com/ugd/30850e_d2984a54f505451c9bb60e4d0cb9c1b4.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_859546a985914f2db554fb0cabf5fb1e.pdf?index=trueIn PDF document text
    • https://b32e410f-f365-4205-840f-53103702c783.filesusr.com/ugd/51ece5_b240bcc30f9f4b44b51196a9dd313fb5.pdf?index=trueIn 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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 5724 bytes
SHA-256: 9f97657a00900f8964039708e6943f6d83e5e6ce53060e1497bbd3c2fd8f5dae
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 11164 bytes
SHA-256: 751d9769388f6e742b9dc01fa6813e9f0d67cb29f7f0e986a876fcb2bd06860c

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