Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24a5edf531ab6fb…

MALICIOUS

PDF

81.2 KB Created: 2021-03-15 14:34:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 54ce0497888291333f5a1b06464c3b08 SHA-1: e8130ada1e937e5c7a78a684a29352fc89ec63b9 SHA-256: c24a5edf531ab6fb433483f4e27c49085526a3f1fffbe0f214be6a6c82384aaa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=the+future+of+life+edward+o+wilson+summary PDF link annotation
    • https://jaradaka.weebly.com/uploads/1/3/0/8/130813635/7134274.pdfIn PDF document text
    • https://wozukofa.weebly.com/uploads/1/3/2/3/132303282/de21e3020e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_600cc59e8a2ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5fcb1d53e45df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465144/normal_604cc69a13096.pdfIn PDF document text
    • http://honey-love.ru/siwigixisutodoripone7l775.pdfIn PDF document text
    • http://todayit.pro/9973635299x5x9g.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/7688947.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/bumafawiwimuvep_febetod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0cbdf124-194d-41d0-8d98-e0d8d3b0a276/80920004582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a38b23-09b1-47e9-9d94-e453325d3fd9/how_do_you_restore_an_iphone_without_a_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/starbucks_cold_brew_with_coconut_milk_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e96d6dc-21ed-4217-98e1-166f89f34005/97835022836.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/essential_university_physics_volume_1_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/69980258.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/nojemavolusivonilux.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/amref_kenya_internship_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20104162-0948-4082-be73-890bd94861d0/49306866960.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/solving_two_step_inequalities_worksheet_8th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/gebamudaruwotovi.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/vox_ac15_heritage_handwired_review.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 5172 bytes
SHA-256: 2374a31e1b74c7831e971e2e205ec55afc6d5df946931b82d117d71e661adced
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 10832 bytes
SHA-256: 310812fa67d813e0650d1ccd64a18d9549e2fd31f1879ea66f779bb46be01012
font_02_sfnt_off000128f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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