Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f83b10ee3a2e78b…

MALICIOUS

PDF

71.1 KB Created: 2021-02-25 15:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 76d7740ee3bc7354851678b058004bf4 SHA-1: a2208c233f61e9ba223f3c809ddd9b89bad49bb9 SHA-256: 8f83b10ee3a2e78bb004e52ac458789d0c98392585892b853ed79c113a5d2fb0
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain keywords related to product information, suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=kenmore+70+series+washer+drain+hose PDF link annotation
    • http://lnstagramcopyrightmanagement.com/aluminized_plastic_sheet7v31p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_60093ed3b3f10.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/rekepatirawitixipebap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5fee95c30a9b4.pdfIn PDF document text
    • https://gobadinemi.weebly.com/uploads/1/3/5/2/135299992/bbd70929cc.pdfIn PDF document text
    • https://nudesobaxoxis.weebly.com/uploads/1/3/4/6/134666739/kijugakoviralimotu.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/can_you_be_a_nutritionist_without_a_degree.pdfIn PDF document text
    • http://boomerangoo.site/calories_in_boston_market_chicken_breastgfpzf.pdfIn PDF document text
    • http://eu-study.ru/acer_aspire_5742_drivers9qp7n.pdfIn PDF document text
    • http://delinapod.mypressonline.com/2._what_are_the_reactants_and_products_of_cellular_respiration_and_photosynthesis.pdfIn PDF document text
    • https://xumijarivibamow.weebly.com/uploads/1/3/5/3/135339210/e4d733f5206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_6027d13a45d14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505159/normal_5fdd3c70448a1.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/tedowafomaru/fejikejirujusak.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/70873664893.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/persona_4_golden_achievements_steam_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/list_the_first_second_and_third_estates.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/73015465078.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/wakidemenifosezirekiriket.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 5316 bytes
SHA-256: 06560b00fdf389ba0bdba945022dd34be95cf7cf75d7c9594aebccff2ede24bf
font_01_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 9656 bytes
SHA-256: 1e24af92faf2074a8e1a83090bfd4d571fb9efc5d3b24d61d5c579daddeb0f27

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