Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6850dfb5fb4ae45…

MALICIOUS

PDF

79.3 KB Created: 2021-03-29 22:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a46fd9fb56d54f428a0286f742974296 SHA-1: 8f3827810d289f9aa672c2e448b972e49f120095 SHA-256: c6850dfb5fb4ae45370c96273cd3fb2c3ec81ba74efdf19455ddc55ab5429221
156 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 0.9957

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://midufefew.ru/award?keyword=adobe+premiere+pro+cc+2020+pdf+free+download PDF link annotation
    • http://repochka.site/buvevefixeto6k8f0.pdfIn PDF document text
    • http://biggymstoe.com/what_is_meaning_of_web_servicesfp5z0.pdfIn PDF document text
    • https://xejoxobufedad.weebly.com/uploads/1/3/3/9/133997298/kodubupanazimerosiw.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/brjhDtB/50760332443.pdfIn PDF document text
    • https://cdn.sqhk.co/pipagalax/gfzKepk/mufixenad.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/gfYja0I/5344071834.pdfIn PDF document text
    • https://korenumotijele.weebly.com/uploads/1/3/4/6/134687452/fc3eb91dfc04c.pdfIn PDF document text
    • https://cdn.sqhk.co/pijavagoke/hcheyv4/crazy_for_speed_2_mod_apk_hack.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/putapatugugiruf.pdfIn PDF document text
    • http://kellys.space/42282814271el5w0.pdfIn PDF document text
    • http://timurberg.ru/seventh_day_adventist_exposedyc78o.pdfIn PDF document text
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/abc784461831ea2.pdfIn PDF document text
    • http://lifeit.pro/sas_ods_graphics_designerdeu2p.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/joterige/how_to_override_ifit_on_nordictrack.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/viwulametimibuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/konakuvekeja.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/clinicare_sheet_mask.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_cd357edbcd264ae395162a07bf822e1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geraromu/wegeziz.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/cv_template_uk_free_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/sample_email_asking_for_informational_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/hooked_on_country_line_dance_step_sheet.pdfIn PDF document text
    • https://366cd995-4ddf-4220-a197-7cea849caf0e.filesusr.com/ugd/947062_7222777745d84c3f9b4615212e15774b.pdf?index=trueIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_4c00627a44be4604ba3f6e806453c021.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurafoga/zukinavusolofanopowidozi.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_4456b2e1eef941689012a433a490e2ce.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_f71abf3c3afe453d928be966040b2da6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 5620 bytes
SHA-256: bcf8031a0c0530d6addd06295d21f9a8efe1b25d1ca98f45976eb11b2b5c21d8
font_01_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 12508 bytes
SHA-256: 92a011fe32fe80df93dcffdb4f4c5c2e8a630be369caa7c01f8e44a107033fe0

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