Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f698e667490767…

MALICIOUS

PDF

130.7 KB Created: 2021-05-22 17:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06a46ca341012f11239773a95e1b8d1a SHA-1: f35321c211e9e77690a737b97ef49564df4573b5 SHA-256: 03f698e66749076700baf65a350bd4a0c266b69b0948d7c0f513af312c710de7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, appears to be a lure related to a product manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kuzutuzo.ru/wb?keyword=sennheiser%20rs%20175%20rf%20wireless%20headphone%20system%20manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464301/normal_6027be8bd4e14.pdfIn PDF document text
    • https://zitejapaj.weebly.com/uploads/1/3/1/8/131872087/7962513.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/manipadogose-sewasow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_6034001db4ea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_60659889379e5.pdfIn PDF document text
    • https://pexasuwen.weebly.com/uploads/1/3/4/5/134593650/5723402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_6021d2bdc4aa4.pdfIn PDF document text
    • https://gejilesiwurulu.weebly.com/uploads/1/3/4/3/134374779/suzewopiwurek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491426/normal_5ff0f66c34e70.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/8e09d53c-c9c9-45b3-9c2a-afedfbca882e/nissan_frontier_repair_forum.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/medicare_levy_exemption_2019_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/how_to_remove_jacuzzi_tub_jets.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/anexo_8_oaci.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15bb0043-ff8f-4a0c-bab7-906a7bb553ec/how_many_books_has_louis_lamour_written.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4bba92-74f1-4e4e-a7e3-5f380dd1cf15/harry_potter_and_the_chamber_of_secrets_chapter_nine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9253bf29-438a-44a3-97b4-74fefc456e95/wisumagagawunasixoloz.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/cerebriform_nevus_icd_10.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/is_1280x1024_stretched.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2d7771-618d-4db6-9fc9-fa7bb862c59f/39563997432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bcbdc0-6253-4d78-a758-ed06f7a5f093/sista_beauty_supply_on_87th_dan_ryan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d01397-b4f6-48fd-bde4-84ab96189367/char_broil_4_burner_bbq_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7201776f-e873-459a-a046-fdd36aacd0e5/toefl_conversation_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/vexamogujaraxaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/national_dysphagia_diet_guidelines_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/azur_lane_morale_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/50649598246.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/classical_guitar_sheet_music_and_tabs_free.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_off0001a4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4EF 5836 bytes
SHA-256: a4d008b9859348797f1e168a2811e5f90d8f59b434bc666d3531d724b4138796
font_01_sfnt_off0001b8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8CB 13548 bytes
SHA-256: 4e5a00996ec3a86f00c26303e6c6234fad071c4e2d8e477019500dca12c2e9bc
font_02_sfnt_off0001e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5A1 16484 bytes
SHA-256: 59396eaf4ec757606b3212db8211284e220acf8bdf8cffe72a509af59d1f84a3

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