Malicious PDF — malware analysis report

Static analysis result for SHA-256 144ae72501370734…

MALICIOUS

PDF

73.5 KB Created: 2021-02-24 06:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b84689ec83aa51838314f479f3e95a99 SHA-1: 23f982c9e4c96914cf00ca7a85addc956448adfa SHA-256: 144ae725013707348930e4e5615d1801f92ddcfb9d44c8d735ec6928dc22ac80
126 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 0.9997

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://jottigo.ru/strik?utm_term=which+character+in+les+mis+songs+on+my+own PDF link annotation
    • http://dkmz2.club/apocalypse_now_analysisjzqlt.pdfIn PDF document text
    • http://wukifiduputafeb.22web.org/43018480448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421199/normal_5ff436e7c7bf0.pdfIn PDF document text
    • https://gulipuzajetag.weebly.com/uploads/1/3/5/3/135397689/nuxenan.pdfIn PDF document text
    • http://smirno.life/25776030949ht2as.pdfIn PDF document text
    • https://betutemibo.weebly.com/uploads/1/3/1/4/131453998/6d6a48d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_601b8406123b5.pdfIn PDF document text
    • http://naturwow.space/vakedasowovugufaveboxarjpn.pdfIn PDF document text
    • http://mandarin-fruit.space/304478856212rl66.pdfIn PDF document text
    • http://wutulesarox.iblogger.org/digital_marketing_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464707/normal_602ce23e49bf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5ffa4eaecbbdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jomozaredid.rf.gd/vijayanagar_and_bahmani_kingdom_information.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/lifug.pdfIn PDF document text
    • http://fasilew.epizy.com/theological_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/93526825389.pdfIn PDF document text
    • http://sulevufezokul.rf.gd/galaxy_watch_android_os.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/guide_to_basic_medical_terminology.pdfIn PDF document text
    • http://dekuroveki.rf.gd/where_can_i_learn_photography_in_port_harcourt.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/graphing_trig_functions_practice_worksheet_with_answers.pdfIn PDF document text
    • http://wupaxozejite.rf.gd/happy_birthday_bestie_gif.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_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 5420 bytes
SHA-256: 4b74c1f8ce0856b2928a7ebdcffcc278dcab9677803f64dbfc5e990680b1b2d3
font_01_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 11276 bytes
SHA-256: ac805a48a33f5bb2f33dc9ce3bd835e09bb4fb152f2ec8db4c91cc694b83a212

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