Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16c93e2c1a827bc…

MALICIOUS

PDF

86.8 KB Created: 2021-03-06 17:12:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f6b9d883317b5442f93886190f9505c4 SHA-1: 0b7359486d1ed864ba627bb2d88ea212c403cfd3 SHA-256: d16c93e2c1a827bc3e7a5783370129a6ea389a071cd005d6cf74482d56a5f663
186 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 hosted on disposable domains, characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=which+countries+are+near+to+equator PDF link annotation
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/a8dfca5dc46e6a.pdfIn PDF document text
    • http://003-center.ru/2000_ford_ranger_truck_bed_dimensions7b3g0.pdfIn PDF document text
    • http://kupiokno.su/616724462219nbrj.pdfIn PDF document text
    • https://gagezomelebagam.weebly.com/uploads/1/3/1/6/131606069/xezit_vimevip_pezup_wenuxanug.pdfIn PDF document text
    • https://kevosenebiv.weebly.com/uploads/1/3/1/8/131871602/0eae2478633ba0c.pdfIn PDF document text
    • http://devlp.design/5933057685fta00.pdfIn PDF document text
    • https://pazunorafozide.weebly.com/uploads/1/3/0/7/130776571/riwewanowa-vivewelulozibem.pdfIn PDF document text
    • http://shoop-fk.ru/70255604859d2wus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_603247beedaa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_603951ff7aee2.pdfIn PDF document text
    • https://derajuxojop.weebly.com/uploads/1/3/1/4/131452827/5265054af.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/govowawelapado.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/1796531397ods8w.pdfIn PDF document text
    • http://ar-foto.art/doro_clamshell_mobile_phone_reviewsjcwy5.pdfIn PDF document text
    • http://idealica-it.website/arctis_7_best_equalizer_settings_for_gamingq0qax.pdfIn PDF document text
    • http://smartycredit.info/voxerepawoaiief.pdfIn PDF document text
    • https://bapanezuginu.weebly.com/uploads/1/3/5/3/135310050/binemonupomajabesuli.pdfIn PDF document text
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/5612632.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/bupoloxojipug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501634/normal_5ff7b9d071b4b.pdfIn PDF document text
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/tulevuzasavokovalab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_5949ef5cb6274d5e92aa2cc94652ba30.pdf?index=trueIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_32c4e50352cc44c0baaad599673610a5.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_a3b9010f89214396ba80e0da7eae6942.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_c2f6b37bfab44ec5b9dd0ba019a9ecf6.pdf?index=trueIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_2f04f94f00c64b38b44b03fface242d2.pdf?index=trueIn 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_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 4996 bytes
SHA-256: 98a6c4d791ee28557b60d0382f131d6513d4fff5ae1d2da7cef661d444427df7
font_01_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 12340 bytes
SHA-256: a8a2357a81176ebd351edc8aa86de6b82dc3d0566606bdfaa8e82ce6962a98b2

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