Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc43cbbdbb98b7f…

MALICIOUS

PDF

68.4 KB Created: 2021-03-16 07:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6f36779d33bbf3684a44ade553bbd0ad SHA-1: baeb9d9f17e7a4a4697048e72cf72e6c377b7eb4 SHA-256: 5bc43cbbdbb98b7f9d5c5e825c829c822d6b58f21f466e8f9f911826822da6c3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and external link behavior suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://druttle.ru/strik?utm_term=toro+timecutter+ss4225+replacement+blades PDF link annotation
    • https://cdn.sqhk.co/segenapiza/mTGU6es/vobidogobasefam.pdfIn PDF document text
    • http://deromgroup.com/68616483904o683r.pdfIn PDF document text
    • http://urolog.xyz/rival_knights_apkn5uhc.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/gj2NSz5/como_ganar_diamonds_gratis_en_my_story.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/fgfiaej/house_paint_colors_exterior_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499958/normal_602f864b10eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_6044cf610a149.pdfIn PDF document text
    • http://rebelliona.online/amazing_god_you_can_do_all_things6y9b7.pdfIn PDF document text
    • http://rm-swis-mine.com/41065354240iwj4n.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/fakodt8g6d.pdfIn PDF document text
    • http://kfcrabota.ru/talk_to_me_in_korean_books_reviewt9nto.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/ha1Lhii/64846870162.pdfIn PDF document text
    • http://iuts.space/survival_server_minecraft_pe_anarchyz3ukz.pdfIn PDF document text
    • https://cdn.sqhk.co/nogegamapagi/ifiahiF/best_adventure_motorcycle_helmet_uk.pdfIn PDF document text
    • http://hookup753.fun/charlas_de_seguridad_de_5_minutos_en_mineria96mqr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448545/normal_6015c30941317.pdfIn PDF document text
    • http://fewomazojuxed.iblogger.org/vusisegudipapozeveze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejifavo/nedaxiranijunifivarin.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/election_commission_of_delhi_form_8a.pdfIn PDF document text
    • http://lekodabiwizu.epizy.com/905196602.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/3_point_perspective_drawing_easy.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_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 5652 bytes
SHA-256: 577f20cfbeed9b16527ab23ed5ea9cfcd67f190aa0fea35009a5c239c4d26cbf
font_01_sfnt_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 11080 bytes
SHA-256: 3c74543e814a01f6415d196dd1686c5e8dfe98932a372b97828e65295ae6a315

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