Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e797bc139ba4d61…

MALICIOUS

PDF

73.7 KB Created: 2021-04-03 17:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b21fdefc2d2ea42e9d3632f35b5b57fd SHA-1: eb6d0d985a5ff67cb1fe0a73731eda0014393fae SHA-256: 0e797bc139ba4d6109842fb160cd175d4a625bfec19722e0b6c9a7cc33262e8b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One prominent URL is 'https://maypoin.ru/wix?keyword=fuzion+capacity+500x0.1g+manual', and another is 'http://dodupubi.epizy.com/dopukivojuliguxikowexu.pdf'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/wix?keyword=fuzion+capacity+500x0.1g+manual
    • https://torusakewojowep.weebly.com/uploads/1/3/0/8/130814967/9349450.pdf
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/pajaz.pdf
    • https://tewamuwomipatus.weebly.com/uploads/1/3/0/9/130969874/fufuwasasejajag_pamanabitow_vupolimefep_selozaxogabakev.pdf
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/jibixidoruve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dodupubi.epizy.com/dopukivojuliguxikowexu.pdf
    • https://s3.amazonaws.com/xukanomarexumu/77954905339.pdf
    • https://s3.amazonaws.com/wovugi/ketunitavelinelaz.pdf
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_ac8088389e4b46e091f7d4a72e39de4c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/45d6bd77-b1c1-4cbe-9d06-4858d637cbe9/88258887528.pdf
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_c6e8d645bfea44c593c50b1834617547.pdf?index=true
    • http://rilefup.epizy.com/graphics_design_bangla_ebook_free.pdf
    • https://s3.amazonaws.com/mukutud/devakakuwewagu.pdf
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_8946793a7ee242769d7a4c63e4b5c6ca.pdf?index=true
    • https://s3.amazonaws.com/sasufufa/excel_online__google_sheets.pdf
    • https://s3.amazonaws.com/nuxepiduded/cover_letter_block_format_spacing.pdf
    • https://s3.amazonaws.com/purawuma/disaster_management_powerpoint_template_free.pdf
    • https://s3.amazonaws.com/tubupejevomo/5701320988.pdf
    • https://uploads.strikinglycdn.com/files/1d81d910-a9ec-44f8-8a0c-0ca2ff2c6461/irregular_plural_nouns_worksheet_grade_1.pdf
    • https://s3.amazonaws.com/zodawanuror/tchaikovsky_piano_concerto_1_sheet_music_free.pdf
    • https://uploads.strikinglycdn.com/files/5fe5aeca-0a8d-4b75-acae-4816ecb824a6/garmin_oregon_650_battery.pdf
    • https://uploads.strikinglycdn.com/files/226cd9c3-2041-4332-80b4-b60903c243c4/65902660238.pdf
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_2ffe42b6f8d94157953821aae69e8764.pdf?index=true
    • https://s3.amazonaws.com/lowuwofuxali/antivirus_para_android_2019.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_off0000e133.bin
4f6774ea88cd8e2f1fad5496d7f8e7376e62100d53c8a142f07bffe52e2ba5f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 5504 bytes
font_01_sfnt_off0000f410.bin
d524b734a5fe79b4ab42f18e09c626c8c8fdc31bc4c364a3e55c51d1c7e9d6c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 10764 bytes

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