Malicious PDF — malware analysis report

Static analysis result for SHA-256 983d8af2143e5fd3…

MALICIOUS

PDF

84.0 KB Created: 2021-05-18 20:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8b17c98084b30688d4d8f8d2867fe349 SHA-1: f3773aa814ee001a71350f8afdc3d24acd402313 SHA-256: 983d8af2143e5fd3bd885f0649267e385c8a099ce1b3ab0177eec4ffd8974332
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 0.9995

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://baarspo.ru/strik?utm_term=ejercicios+de+moles+a+gramos+resueltos PDF link annotation
    • https://batidokupofow.weebly.com/uploads/1/3/3/9/133999778/jebejo_rusemulafamosom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_6019f0c112731.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/dadofejipewosunirox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_6046c5ebd0f59.pdfIn PDF document text
    • http://kozaredibedemok.iblogger.org/laars_boiler_rep_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_600b0e66e3d82.pdfIn PDF document text
    • https://fogurasetaj.weebly.com/uploads/1/3/5/9/135961985/0015b8c59.pdfIn PDF document text
    • https://lakiregatu.weebly.com/uploads/1/3/4/5/134589313/9389771d1b0.pdfIn PDF document text
    • http://wujanebinemeru.iblogger.org/44353179274.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6d1ef9-6693-4f02-88be-120bd7e36644/molecular_cell_biology_7th_edition_solution.pdfIn PDF document text
    • http://savefativiluz.epizy.com/fosawepokopekow.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/fomabenovarafivijigatuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/audio_editor_free_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62160f4-88b4-4c51-989a-7cdc1a0b3e12/16194502510.pdfIn PDF document text
    • http://dudezela.epizy.com/algorithms_in_java_sedgewick_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/lanugesegekodom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfab1c59-bcfe-41ef-8773-a43e5563ea24/aa_battery_charger_and_maintainer_review.pdfIn PDF document text
    • http://tifureboriva.epizy.com/inspection_report_format_for_garments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cfc180c-5872-49d3-8758-85a93a1f1584/megagez.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/xobubakodapipezusidabo.pdfIn PDF document text
    • http://punirasum.rf.gd/automotive_mechanics_salary_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/8522123553.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 5292 bytes
SHA-256: d979674b4d22e4ec45c9e45f5020636159c0393291ba058d9c188880439cd60f
font_01_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 12520 bytes
SHA-256: 925114d8ad142b0d7201fe0b10c14335295afb00327c348b11a5c33e784f4d99
font_02_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 16132 bytes
SHA-256: 267fa55b14ef4cf900efb316cf3a679441c5cb47c67db7c400ecf172ea91784f

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