Malicious PDF — malware analysis report

Static analysis result for SHA-256 1810ab436c611fb1…

MALICIOUS

PDF

81.9 KB Created: 2021-04-02 16:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5ee3c73996b5574e7b173f342283b3b SHA-1: d9757d2596c39dc862b4cca4aeb8a2d099064e87 SHA-256: 1810ab436c611fb174c9a6ec59cb991d6714bdbdfefa56685dd6c24d098d31fc
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that mimics a search result for a specific book, likely intended to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely delivered via email as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/award?keyword=biochemistry+satyanarayana+4th+edition+pdf+download
    • https://cdn.sqhk.co/viwedanej/gjCeWyV/butler_farm_show_2020_dates.pdf
    • https://cdn.sqhk.co/vuramufef/Akvgjjh/71721263331.pdf
    • https://cdn.sqhk.co/nisugavu/PujhaId/6167659216.pdf
    • https://cdn-cms.f-static.net/uploads/4386079/normal_6014ccb37ce30.pdf
    • http://pepariravifaza.getenjoyment.net/47622453793.pdf
    • http://sesesuruko.mypressonline.com/oregon_coast_map.pdf
    • https://cdn.sqhk.co/gixelotopa/ghViahb/9558294006.pdf
    • https://cdn.sqhk.co/jipuxoxukul/5iiVnS6/19649183830.pdf
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fce47863f94c.pdf
    • https://cdn.sqhk.co/goberirud/ojfjhh7/saledexutifol.pdf
    • https://cdn.sqhk.co/vugasoveg/5dNjfbW/juventus_news_ronaldo_7.pdf
    • http://rudovatimokasum.medianewsonline.com/4th_grade_math_workbook_with_answers.pdf
    • https://cdn.sqhk.co/luvutagawata/3mWczas/jelepebimewelaki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e88d9604-facd-408d-9c8a-ca284d82344a/55632102994.pdf
    • https://uploads.strikinglycdn.com/files/d3c972e9-da26-443a-b6be-0b08747b1310/wadikip.pdf
    • https://uploads.strikinglycdn.com/files/2b0676eb-c33c-442d-87e1-2a3fdd09a78b/institutes_of_the_christian_religion.pdf
    • http://bepolujogox.atwebpages.com/gate_electronics_and_communication_book.pdf
    • https://uploads.strikinglycdn.com/files/b8005528-14ba-4133-a034-cc2804adefc2/79663233046.pdf
    • http://kapirexazi.onlinewebshop.net/89478602704.pdf
    • https://uploads.strikinglycdn.com/files/47dffb69-e2d2-44dd-bbe4-158d86e20241/bose_universal_remote_device_codes_book_australia.pdf
    • https://uploads.strikinglycdn.com/files/bb4df6dc-dd25-43e6-8d3b-178cfb6c7732/free_chilton_auto_repair_manual_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26e.bin
7d83d792918f0018262331bef3af328aa0832ca3d845da9a97e38ab255a6ac1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 5512 bytes
font_01_sfnt_off00010512.bin
f1faf50d0ff921cce4792915314d6ddc4b043a7eec4ee104dde99e1bcb53a7ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 10740 bytes
font_02_sfnt_off000129c7.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 4324 bytes

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