Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c95b2b741f9f6b…

MALICIOUS

PDF

78.5 KB Created: 2021-03-22 00:00:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d8b11bc2b460848a029a1b89e5fefb48 SHA-1: b3cf9f99df85217df8fb00a8918987cb69505e63 SHA-256: 71c95b2b741f9f6bdb7e4d8605ed71fff2418e00c164d94d0fff66c9de073fc7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting it acts as a lure to external content. The PDF structure and embedded URIs are consistent with phishing or malware distribution campaigns.

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 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://druttle.ru/123?utm_term=gilded+age+urbanization+and+immigration+worksheet PDF link annotation
    • http://cz-nitrof.website/41462765150luk1f.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/c0rijge/sultan_the_game_video.pdfIn PDF document text
    • https://cdn.sqhk.co/lowimipofevu/jfoqthi/vifanokapomitutitug.pdfIn PDF document text
    • https://vipomumukewa.weebly.com/uploads/1/3/0/8/130813786/73c5259a62.pdfIn PDF document text
    • http://vykupavto54.ru/fokobixowamipasetemelaxon76wb.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/lidanijow_wotenolukudutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375908/normal_5fe11a311345b.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/pdf_autoestima_en_mujeres.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_6024cf2c54337.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/jurnal_asma_pada_anak.pdfIn PDF document text
    • https://cdn.sqhk.co/nogegamapagi/f4ghhgd/35518123775.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/ncees_fe_exam_preparation.pdfIn PDF document text
    • http://photoforce.ru/zagg_folio_tablet_keyboard_case_for_ipad_air_2nqxob.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/KQggpia/39952156850.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/fesikivusiwegir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_60357714f1c5c.pdfIn PDF document text
    • http://trenketo.buzz/18194580880bgvlb.pdfIn PDF document text
    • http://lagejarejitog.mypressonline.com/what_are_the_basic_rules_of_differentiation.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/ejhijcI/3411987324.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/6d1cd06.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/d4522a45-f3a1-4bb4-899d-e6997e9e9147/hp_laserjet_cp1525nw_toner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e014abdf-ba90-4c13-becd-94021cb350d1/34120221258.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_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 5616 bytes
SHA-256: 260148161814271aa07e93cd283807efef7af2856b787a5347f9ae4c9c34064a
font_01_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 11032 bytes
SHA-256: c2e48df5fa78dbf9dbe9f8c1dc5d9ce1789f12418ea5aba39e8f9097cd58ee2d

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