Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6848b5b50dfaca3…

MALICIOUS

PDF

79.5 KB Created: 2021-04-04 07:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fdeb5606c3b0c5fd5b536c6663d17254 SHA-1: af5e0a14d955724580a870814cba0659b2aaac27 SHA-256: b6848b5b50dfaca36c32ae945f209b6fd91ff85b9e09e3dcb8c105cdd3b0846f
126 Risk Score

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 0.9998

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 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://jumiwimov.ru/123?utm_term=fractions+without+common+denominators+worksheets PDF link annotation
    • http://zakomuxoza.getenjoyment.net/26582563032.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/nonipezovukusasabedonetij.pdfIn PDF document text
    • http://nekretnine.site/vintage_avon_jewelry_price_guidem7na3.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://outputqwvk.space/75186738154z2bd7.pdfIn PDF document text
    • http://gsmall.space/41276747928mdbvq.pdfIn PDF document text
    • http://ladirojenovezoj.mygamesonline.org/1633049148.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/pukivoxigoveku.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/pusolefosex/maganopusiw.pdfIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_a874bb30dd754ed1b91f723476f59aa1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/676706992.pdfIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_d94453689bf84b028a81eda37b478a5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisi/98570741203.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/97415310411.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_ca48bd7c934d41d88f2708d2e47c4ba2.pdf?index=trueIn PDF document text
    • http://fikelamizogu.myartsonline.com/movemipeganubekalel.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/27350885856.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_ea591a324eb94ff688bcf302da5e8b85.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_b5bdbf7155484d04a7ae3202d631f248.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 5140 bytes
SHA-256: b12e992f58208259bbe74fe3a6bbc87b1f8e37f5b90795de3930878bbef98e3f
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 10716 bytes
SHA-256: 0a46f8031ba9d38dc79de82af6a8443e3796bcdf6932211b57f453a4f371cd2a
font_02_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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