Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca920c8eee90713…

MALICIOUS

PDF

75.7 KB Created: 2021-04-01 04:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f28ab29dff66f149146bccab342900ac SHA-1: 58ce87eea14f5ef35e19c500d605312ae86017de SHA-256: cca920c8eee907139c17b20af07c8acb3ab6dd3a66816943c830cdc0ceff9d57
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 0.9997

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://dugedepap.ru/123?utm_term=clarinet+sheet+music+intermediate PDF link annotation
    • https://puralabeno.weebly.com/uploads/1/3/2/8/132814071/wujalamugazedov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5fc87a7df1554.pdfIn PDF document text
    • http://damvglaz6.xyz/how_to_choose_cup_size_on_keurigd59gl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_60612c4c6100b.pdfIn PDF document text
    • http://helpforteam.com/31274949809fveb9.pdfIn PDF document text
    • https://weposatozexutav.weebly.com/uploads/1/3/4/3/134314203/malenabubu.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/enfoque_de_genero_definicion.pdfIn PDF document text
    • http://bestsalestoday.xyz/397113808299ujx5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501486/normal_5fc6b13a26583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fc89c4a12f0c.pdfIn PDF document text
    • http://sanelobazigi.medianewsonline.com/learn_english_story_book.pdfIn PDF document text
    • http://inglassrus.ru/vakafamodokugugujuvemije3aosq.pdfIn PDF document text
    • http://rusakadovub.sportsontheweb.net/200_125_ccna_v3._0_book.pdfIn PDF document text
    • https://weposatozexutav.weebly.com/uploads/1/3/4/3/134314203/rijululuze.pdfIn PDF document text
    • http://vuroxinizona.scienceontheweb.net/kobugex.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/62fde6ef7d940b5.pdfIn PDF document text
    • https://vatilevemuwaji.weebly.com/uploads/1/3/1/4/131453872/pobetidevoza.pdfIn PDF document text
    • https://xufipenisugiw.weebly.com/uploads/1/3/0/8/130873979/9068746.pdfIn PDF document text
    • https://kobuwejen.weebly.com/uploads/1/3/0/8/130873730/5862496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/alice_and_wonderland_jr_script.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/do_all_states_have_a_progressive_state_tax.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_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 5084 bytes
SHA-256: 81118ce01dbfc938ffad16f48f5f63bbf4f9c1079d3c5a23482e07c47717fe12
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 10656 bytes
SHA-256: 2cd0182a7237b840db12e47e29eda39a13599f546d6a6d5d2ba96f2806f9daa6

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