Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab22d280eb908b8…

MALICIOUS

PDF

79.4 KB Created: 2021-01-11 07:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 256e5715037038bff78013dab6f80489 SHA-1: 9fdf5faeb0364b25bfc35ee333981228a7ac992f SHA-256: 2ab22d280eb908b8bc396706d5e2723d710dbee6c218838965b8fa2f8f3c2523
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafffe.ru/aws?utm_term=bedtime+music+for+babies PDF link annotation
    • https://kakijukiwobak.weebly.com/uploads/1/3/4/3/134322026/3379055.pdfIn PDF document text
    • https://site-1178588.mozfiles.com/files/1178588/biography_of_bhagat_singh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458824/normal_5fc8df4ce6d54.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/1606857.pdfIn PDF document text
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/nujiximo_xapuzupajagol.pdfIn PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/risisekilokupamefizip.pdfIn PDF document text
    • https://xezamojukugenu.weebly.com/uploads/1/3/5/3/135316948/winilesovadegoboz.pdfIn PDF document text
    • https://juniverobov.weebly.com/uploads/1/3/5/3/135317499/nekuliwug_dokuzen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_5fc075b268ad4.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/zerejibixupav/12725592508.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/dell_inspiron_7567_spec_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/baloncesto_en_silla_de_ruedas_reglamento.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/alderbrook_sixth_form_moodle.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/pujuravujafokivi.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/salesforce_report_cross_filter_limit.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/zoetropic_pro_apk_free_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/superman_google_docs.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_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 5324 bytes
SHA-256: 9b9b2496f7a6929e9eb23d87b39bd3e606424ae5c5161e16679ae458bc734e71
font_01_sfnt_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 10560 bytes
SHA-256: 01f77cd0331f3a2efc3ad602e21bc336ac16d8fa4a3289c773cc0da863a80b5c

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