Malicious PDF — malware analysis report

Static analysis result for SHA-256 3638cda10376e994…

MALICIOUS

PDF

80.4 KB Created: 2021-04-21 03:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8d9e5cc6927f50e41808d8c7d8e33001 SHA-1: c540ab2ddbd6f2e7564814fbdb29b9715a462acb SHA-256: 3638cda10376e99480703ee2eef5ff7c681d9e01c498ad6a42d2e705542ee878
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-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://baarspo.ru/strik?utm_term=oxford+dictionary+look+up+online PDF link annotation
    • https://cdn.sqhk.co/fiwujumejuf/hhaxAie/getasom.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/dupematugejowabiweripo.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/how_to_write_essays_for_university.pdfIn PDF document text
    • http://helplnstagramoffice.com/why_did_my_atomic_clock_stop_working3n2k9.pdfIn PDF document text
    • https://cdn.sqhk.co/zajikeze/VNXgdzQ/microsoft_excel_spreadsheet_test.pdfIn PDF document text
    • http://brettlockhart.com/xamuwipovirilolakix6ouct.pdfIn PDF document text
    • http://plsale.pro/mofiwajsaouk.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/giahfjb/gitevevupabup.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/h8hhfij/lamozefuvoxubosekogeti.pdfIn PDF document text
    • https://cdn.sqhk.co/xupebasolaw/Sk1gf9i/61650812992.pdfIn PDF document text
    • https://cdn.sqhk.co/wugotiparo/jejaigC/jokop.pdfIn PDF document text
    • http://kopalirigel.mypressonline.com/aviation_english_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/jbm20jb/xuruwojuxesizojujo.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • http://regsenatvumen.website/xulifasirapes0ckl8.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/3452dec5-e734-414c-ac64-da9e83a283b1/ralph_waldo_emerson_famous_quote.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/79175281109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af552916-6721-4077-824a-6ac8f4299060/the_weary_blues_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/does_fruit_have_gluten.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/call_me_by_your_name_watch_online_free_dailymotion.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_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 5232 bytes
SHA-256: feab54d23d676cce2bd8fc41778d335ca0cb975a7f7480460d83056d451ddb4f
font_01_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 10652 bytes
SHA-256: 528d09fad88c8baf596f48161af33e36c40a1440c78a8e71e6eba3eea99b7f73

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