Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29e9067eb7efc78…

MALICIOUS

PDF

111.6 KB Created: 2021-04-02 04:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2d9b2f31e49b7aa7c504b545efe0ebe2 SHA-1: 0251a70c3bcea243cd69873ebb58864d1aa726f1 SHA-256: a29e9067eb7efc78b6732b6999877c57cdda744e9a5dc7acc602f3f92ae26290
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack, potentially encrypting a payload that requires a password provided separately.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mezovuduw.ru/wix?keyword=autocad+torrentz2+free+download PDF link annotation
    • http://pressit.space/45360469555ii30h.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/the_dictionary_of_real_estate_appraisal_6th_editionft0cf.pdfIn PDF document text
    • http://lisolu.org/daromafujerotnn71f.pdfIn PDF document text
    • http://vsspb.ru/95417759544kmaym.pdfIn PDF document text
    • http://awpmode.com/xaxesuvabemamitugedumuxizus18d.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/43879029761.pdfIn PDF document text
    • http://unosital.space/dolore_all_osso_cuneiforme_del_piede8tx92.pdfIn PDF document text
    • http://nakijeku.mygamesonline.org/petovofebupojipemosek.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/giuseppe_ungaretti_poemas.pdfIn PDF document text
    • http://zapixexarepol.medianewsonline.com/gexin.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/votuweroxigezog/65527039444.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/coordinate_grid_worksheets_grade_2.pdfIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/63684008446.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/transformers_bumblebee_toy_review.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_2d9891de165743d19bedccf2aef0afbc.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_b51d2c05d5d44fa9a0fd0df47a5b522f.pdf?index=trueIn PDF document text
    • http://zipulosi.atwebpages.com/separation_and_qualitative_determination_of_cations_and_anions_lab_report.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_off000175b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B3 5100 bytes
SHA-256: 65d35e5aa01ea011b3ce6fe224f76f0af26feeb47cf3ed40dc80e91d21184566
font_01_sfnt_off0001873c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1873C 13128 bytes
SHA-256: ee604134c5812c987cbfc333c0f33b5c631f10badce19909b90b661ecf2869bf

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