Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8bbd7218b94b4c…

MALICIOUS

PDF

74.9 KB Created: 2021-02-13 13:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b1e9b43fdff05894b6aca909bfa3baf9 SHA-1: f24e6a8aa7a864c983fd49619546fac5d384cadf SHA-256: 8a8bbd7218b94b4c3b3f47b2795f4bd88d3dfa91fea2d7a5ced21d683dff9d3d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains an embedded URL disguised as a genetics worksheet, aiming to trick users into visiting a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple suspicious URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=genetics+punnett+squares+practice+worksheet PDF link annotation
    • http://soinjaga.ru/fufipamatofeludifuke25kz3.pdfIn PDF document text
    • http://monoga.space/woduguxegasorobokoppoyqz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464730/normal_60011fab37c90.pdfIn PDF document text
    • http://tehnotop.space/95628987246hft39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fc87363c093a.pdfIn PDF document text
    • http://bionatur.space/tajweed_quran_in_urduogta9.pdfIn PDF document text
    • http://yesnutural.space/factorising_quadratics_worksheet_a_level8pwj4.pdfIn PDF document text
    • http://edarudost.online/setikafisosijtzk7u.pdfIn PDF document text
    • http://zarabatyivat.ru/film_history_an_introduction_4th_editionuw8wy.pdfIn PDF document text
    • http://constructionhouse.info/roku_se_streaming_media_player_setupfgzxe.pdfIn PDF document text
    • http://podcard2020.site/41607814579fv9wg.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/dejazuvorira/anaconda_3_python.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/allergen_information_mcdonalds.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/arc_hydro_tools_arcgis_10._6.pdfIn PDF document text
    • http://merekum.rf.gd/newark_ohio_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/netflix_series_2019_free.pdfIn PDF document text
    • http://jegovogetaferop.epizy.com/sanilupofuruvefoba.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/zezoderixulijusufi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 5184 bytes
SHA-256: 4cd3a91f5ad1d1a34ce00a4c677cd0335001a177b7fd36fe192a1fa041fcaf6c
font_01_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 10604 bytes
SHA-256: c2876147dea4724b272300438d7dc5e94f2d2d81c760376b5debb96fd5d1f65e
font_02_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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