Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb73132006f2eb82…

MALICIOUS

PDF

80.1 KB Created: 2021-03-12 18:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a2e11ac2a2cbdfaf2daa332d9a866e3e SHA-1: a377124590367ae26d8e7dcf68394120915f122c SHA-256: cb73132006f2eb82c131e8a6609563db125d6d9683329c34a17e4a3b82c86cfb
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=computer+awareness+book+pdf+download PDF link annotation
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/rojagifela-gusan-jatususoselik-felanagafegowok.pdfIn PDF document text
    • https://variwigegepug.weebly.com/uploads/1/3/4/3/134348450/4dc5896d.pdfIn PDF document text
    • http://moymagazin.xyz/dabanebevigivomorite1xm1t.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/ByjhGgi/ice_age_adventures_scratlantis_guide.pdfIn PDF document text
    • https://suzaxuboju.weebly.com/uploads/1/3/4/3/134386311/megozikujegeref_ritego_gujeve.pdfIn PDF document text
    • http://reznitskygallery.com/55919952891ck799.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/g3aigjh/25625802974.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/bxshgih/49622814023.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/1079181.pdfIn PDF document text
    • https://gebuzikiko.weebly.com/uploads/1/3/5/4/135400935/felemumatatixot-zavaruzuvojuz-posumafivusepod.pdfIn PDF document text
    • http://2gusevshop.space/957277479803ff7f.pdfIn PDF document text
    • https://vuxukavimegi.weebly.com/uploads/1/3/5/3/135328550/sikibesisag-kerikizokiba.pdfIn PDF document text
    • http://ighelpcenter.xyz/starcraft_3_trailer_officialm8r5t.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/c281386dd8ec70d.pdfIn PDF document text
    • https://mokufanogokotim.weebly.com/uploads/1/3/1/4/131406807/xakuzizavilujivali.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/jfIW8vq/best_friend_romance_books_ya.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/BKhgsib/monapanexodu.pdfIn PDF document text
    • http://sodalabs.club/binexadajuwizanusebob4jq7h.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/8989edea-11e3-4a69-84ee-0c8b0e3cbeae/84268717644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17943620-b1dc-4101-894a-d6e92177d21b/how_to_write_an_army_appeal_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd678c4-418c-4031-a1c5-4f0cd4c9ec10/riwamotopurijodalifipibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/922486b9-699b-41fc-aa1a-f5b82da53ca0/lugutowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e541575a-279a-4528-823b-d750b35875d2/how_to_reset_honeywell_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/737af9f8-bf44-4d98-b1e6-86b58f693274/how_to_write_a_professional_resume_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53544709-46d8-4438-ae96-214ed1acdfaa/the_book_thief_full_movie_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/142ff8cf-f966-4925-bbfe-02fe2a05841c/super_bass_portable_speaker_manual_em_portugues.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_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 5388 bytes
SHA-256: 9891d3f4da47fe0c719141d4c4475bc2bf57d05def103f8d72cf82058ce3719f
font_01_sfnt_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 10364 bytes
SHA-256: 01df6727f49cd72e5c21a9ca7c34c86ebf5b5a1d152f9552b9525131d47f6302