Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09d89037787b27a…

MALICIOUS

PDF

74.9 KB Created: 2021-03-25 01:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f1c686a2fb6cf1245c9a58bb7851836 SHA-1: 762a42f243529a637923ef2bc89d26f6b1530e65 SHA-256: c09d89037787b27a5021c49642486a8dc209ed904ca1799e46248b8499c275dc
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 high maliciousness. The presence of a large number of external links, particularly those pointing to PDF files, suggests a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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=beqabu+1996+songs
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/686c787df4858.pdf
    • https://zogopovedizojux.weebly.com/uploads/1/3/1/4/131408172/31873549d54d939.pdf
    • https://setijuxuzazoba.weebly.com/uploads/1/3/4/5/134500005/lavolavivi_punidabaj_wetivonul.pdf
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/fiposubajilifugipur.pdf
    • https://cdn-cms.f-static.net/uploads/4384459/normal_6024c58d6dda4.pdf
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/bosomivojov_fuvam_vopanorutimil_gijovora.pdf
    • https://cdn-cms.f-static.net/uploads/4388157/normal_602a44a640415.pdf
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/tomojifunamizeb_mujelefazofu_zuvibaf.pdf
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/tomew-pozeriziko-sirotutovasi-tafubagetorapak.pdf
    • https://cdn-cms.f-static.net/uploads/4448330/normal_6058b0f25b1d2.pdf
    • http://boothattendant.com/fonilekorusujukazesojovr6ci4.pdf
    • http://menformula.xyz/norwegian_cruise_lines_stock_markety4cu4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gowupuzokowuxes/final_fantasy_xiv_gameplay_2021.pdf
    • https://s3.amazonaws.com/zexozavo/zararijaze.pdf
    • https://uploads.strikinglycdn.com/files/b24b569b-b148-462a-9565-8e80ec410955/96423244737.pdf
    • https://uploads.strikinglycdn.com/files/da3718ec-fbeb-43ae-b0d3-81c6f8e60fe2/72874242206.pdf
    • https://s3.amazonaws.com/devuxuzejozam/arrow_season_7_episode_8_subtitles.pdf
    • https://s3.amazonaws.com/kezemiradigu/18746924183.pdf
    • https://uploads.strikinglycdn.com/files/4aa309fd-fe52-44b6-8087-c1cd61bee277/jiperujunosanes.pdf
    • https://s3.amazonaws.com/gupawupigawono/nissan_almera_2005_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/b08b35b2-f202-4e5e-8267-740dbde9e039/lopif.pdf
    • https://uploads.strikinglycdn.com/files/9683337d-f066-4393-b2c3-22c2f46f9eb3/zuxewizisulig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66c.bin
2f17480440b6453c85ba54fc18eeb49db12aa28afcdded7df6275a3c49631f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 5404 bytes
font_01_sfnt_off0000f8e3.bin
c71bbb44d7e57f022e0295d782ebfa104184a20c080f64d8a721e0212493a741		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 11076 bytes

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