Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81cc2ae68619378…

MALICIOUS

PDF

89.8 KB Created: 2021-03-06 13:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 18994bc56233d2d89fcbd5c01b2ddc28 SHA-1: d92d7e45dca3832cf4b30302dae0d9adc5256fde SHA-256: b81cc2ae68619378709366683475500628096614c1260c200c786a48ac32fa62
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 embedded URLs pointing to disposable domains, a tactic often used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

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://leonvi.ru/123?utm_term=the+wise+man%2527s+fear+hardcover PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454545/normal_601683a358532.pdfIn PDF document text
    • http://rekusigixebisuk.22web.org/dosisofizigobi.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/gg6iiP8/amtrak_train_map_california.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/91594362951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_6029e1ced0ba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5fd7630b54a46.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/what_do_the_symbols_on_a_dashboard_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/hdjdShb/descargar_head_ball_2_para_pc_sin_emulador.pdfIn PDF document text
    • http://duxogesubuz.22web.org/past_tense_verb_activities_for_2nd_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483608/normal_60370608937ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mipitevana.epizy.com/dcra_biennial_report_fee.pdfIn PDF document text
    • http://pikuvideposem.epizy.com/falivezir.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/semuluf.pdfIn PDF document text
    • http://kosatalek.rf.gd/wetudukanalobadofuf.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/tozefarovotek.pdfIn PDF document text
    • http://tikolikenugim.epizy.com/ramsay_generale_de_sante_annual_report_2017.pdfIn PDF document text
    • http://kesolimasakifi.myartsonline.com/fevitik.pdfIn PDF document text
    • http://wuparol.epizy.com/phpspreadsheet_add_border.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/14641610372.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/tb_guideline_ethiopia_2018.pdfIn PDF document text
    • http://baperosuvo.rf.gd/78420616559.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 5364 bytes
SHA-256: eb451f37cd1dcee2fc3d03dc463d5bc3d0b9319c16ba902e8d711b5ba88b7ca3
font_01_sfnt_off00013264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13264 12464 bytes
SHA-256: e0608a52b0bf36dae82a3aeb6501a13529de019c30d6b9c485ce4c603cba5cc9

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