Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e44b70f869e09f…

MALICIOUS

PDF

73.8 KB Created: 2021-03-18 23:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 32f5a050e32629b8c02fc021723addf1 SHA-1: 22545446e9ed6db1a786ef4ca449c72897d6abbe SHA-256: d4e44b70f869e09fa9972ab8087403395b6b98ec0f1888bfc5b1931567c8d959
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'nand and nor gates' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=nand+and+nor+gates+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465127/normal_603ba38395b8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_604146581b7e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_6011995e99835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_600dcef872e35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_603e444c57adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_6026f06726eb1.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/17357fed-d11d-4aa3-abd1-e463b39ccbf5/officejet_6700_printer_cartridges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4920917-641b-4184-8560-4df10dff4f9d/mujebenametuxepazanagone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfad28b0-aba4-4ffd-bbe1-7f12889d6309/guilty_crown_season_2_confirmed.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/share_chat_app_video_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c127eb-2da3-45a5-b7a9-7e0048c78bc5/acer_aspire_e5-573g_price_in_bangladesh.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/gameshark_gba_emulator_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc05117-a87e-434f-8daa-cfa55b7338cf/fukisadoxomutozuxitusel.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/kalki_malayalam_background_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ef0a0a-32a1-4373-a22f-698bd998c676/msi_z87_gd65_gaming_ram_compatibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f1eabc-2fbd-4cae-a415-64e1ffc2dab7/93423582097.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/47445286093.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/4173671639.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/4479076592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/145490dc-a01e-4551-9b84-de212d9381a5/love_story_album_yelawolf.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/juwomodopo.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_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 5144 bytes
SHA-256: aa30da38036e47e9e4e806bed710a2ef12794998caf1bc00f8011ab85e81e3a6
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 11128 bytes
SHA-256: 9111f47e3352cde59151bea84ef656011f5e2a0d9ed57c5c2a384d589ad9beee

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