Malicious PDF — malware analysis report

Static analysis result for SHA-256 676bac0c7c935fd2…

MALICIOUS

PDF

85.0 KB Created: 2021-03-13 17:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1ca8721639e7f29c4421ce64603959b5 SHA-1: 9cb62c6325347b336ccd78e3c37b240a00290d19 SHA-256: 676bac0c7c935fd28cd0ba3ca930b0a315defa3f7ea32d7ae3b686930711edce
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://vilenefex.ru/strik?utm_term=how+to+learn+chinese+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5ff9f1e88a980.pdfIn PDF document text
    • http://repair-planshetov.ru/alluvial_gold_miningalf6z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_601c015ba6294.pdfIn PDF document text
    • http://mufadetajamojo.iblogger.org/63908696127.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476578/normal_5ff2059906d41.pdfIn PDF document text
    • http://pawebofub.iblogger.org/xajowaguduzizezoviki.pdfIn PDF document text
    • http://voiprormul.xyz/nokezezojogesebubobt4te.pdfIn PDF document text
    • http://expressvpn.store/825049822593ajkv.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/company_letterhead_free2btkh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vebenok/2019_calendar_with_holidays_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b67c0d0f-bfe8-4461-a860-a5f92314bec4/types_of_statistical_analysis_in_biology.pdfIn PDF document text
    • http://pumumiz.epizy.com/auto_loan_contract_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/emergency_drill_report_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/482d5286-a0bf-484e-81bd-36966e8eb42e/how_to_make_a_simple_wampum_belt.pdfIn PDF document text
    • http://jobagivojik.rf.gd/the_lottery_theme_quotes.pdfIn PDF document text
    • http://mowiredeponup.rf.gd/answers_to_tesco_job_questions.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 7280 bytes
SHA-256: f0dbb5e3b1ca32108df7719e98ed1a46324c14a3c38628ee48a1f6b7ce62b99d
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 4812 bytes
SHA-256: 883f00d70a8b36158b038d3f2675598f76028620901b5b34509dcd0858b28022
font_02_sfnt_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 11844 bytes
SHA-256: 16e1e4f6f57c9eee4f52d2f68072841c33d558321bd3b5ef946e01a3c14e8db9
font_03_sfnt_off000138df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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