Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e4ea6d6353a423…

MALICIOUS

PDF

87.2 KB Created: 2021-03-27 17:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1cdd38367d0af13aa799a093cfc5779e SHA-1: b858168560ae511cdcb680c17a24e848ed473ff6 SHA-256: a9e4ea6d6353a4232dac2fcddace99760217700e5b8ac372a5b9aef619d7bbc3
186 Risk Score

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 0.9996

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://vilenefex.ru/strik?utm_term=clases+de+guitarra+acustica+online+gratis PDF link annotation
    • https://cdn.sqhk.co/fejezolixo/jdjahfk/duwenux.pdfIn PDF document text
    • https://fegixobipe.weebly.com/uploads/1/3/4/4/134467450/12344181488.pdfIn PDF document text
    • http://yandex-dostav.ru/67185654435ur9ve.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/fnKD2Dd/40558764102.pdfIn PDF document text
    • http://hocostyle.ru/jegojetukejalifatojetqsa3p.pdfIn PDF document text
    • https://nokajavu.weebly.com/uploads/1/3/0/9/130969653/37a39c2.pdfIn PDF document text
    • https://kigodobegolalib.weebly.com/uploads/1/3/1/4/131453325/4858174.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/PIlSghH/cnco_band_net_worth_2020.pdfIn PDF document text
    • http://rollernefrit.xyz/lalosugobepu7ytp2.pdfIn PDF document text
    • http://zoomita.space/blogger_template_for_adsense_approval77dx1.pdfIn PDF document text
    • https://cdn.sqhk.co/rokogikapo/kejdYgh/hard_rock_music_playlist_best_rock_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/bjjDjdn/uc_browser_free_internet_app.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/punurum/2nd_grade_writing_prompts_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/michael_swan_practical_english_usage.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_356e55448cee4fa784ec6b2831b031d1.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_e5e3159e0b4d479f873c397f0553e05d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daniwodug/household_expense_tracking_template.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_bb40b6067eb342e6851add708da28cbd.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 5012 bytes
SHA-256: 2b4ed7db9e2ee44294a24a4427d72f000ace114cb329b8580a6ad10a9bd7e97c
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 11984 bytes
SHA-256: fa68b332713396dd2dd84b3bedcca29a9d47ca16747b24d7ffeee926c3dfe9d3
font_03_sfnt_off000136da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DA 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1

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