Malicious PDF — malware analysis report

Static analysis result for SHA-256 4812597f03cf3442…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 04:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5970e9f90b9a307e597436410ba08580 SHA-1: 4939e54bfb5ba48660c87c39b229de1ec173dceb SHA-256: 4812597f03cf3442e98dbf3530d608006437f6ddcba1df948f262281595e2bcb
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are generated to appear as search results for academic or technical documents. The primary malicious link identified is 'https://botokaw.ru/wix?keyword=accounting+information+system+romney+solution+manual', which is likely used to redirect users to further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://botokaw.ru/wix?keyword=accounting+information+system+romney+solution+manual
    • https://cdn.sqhk.co/walumupo/UiecCYp/the_adventures_of_tintin_2_movie_download.pdf
    • https://cdn.sqhk.co/tubafejog/igjighd/rakoxovakomawuf.pdf
    • https://cdn-cms.f-static.net/uploads/4408862/normal_60236e3732d59.pdf
    • https://cdn-cms.f-static.net/uploads/4378165/normal_604a246b1138c.pdf
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/xuneseza.pdf
    • http://raisinshub.club/prometheus_unbound_shelley_analysisqzc0j.pdf
    • http://pmaider.com/on_the_road_movie_review_rotten_tomatoeszu9yd.pdf
    • https://static.s123-cdn-static.com/uploads/4472481/normal_5fca6e9093613.pdf
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/wuxonovugogelula.pdf
    • https://motefeka.weebly.com/uploads/1/3/4/1/134108707/5097888.pdf
    • http://storeeu.info/ninakunijietns.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_c18df1fa80c34529b4e569929e14d2a9.pdf?index=true
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_869cf0945dbf43f9abb99ae5cdb4a7a5.pdf?index=true
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_26419ac34119423083f8b6f3ac627e7a.pdf?index=true
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_ad51433ef4564893a9999105105b124a.pdf?index=true
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_d497a72fc6ec4977950d6a9ba63353f5.pdf?index=true
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_9dbe2b382d814022850146c9a0b52125.pdf?index=true
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_be44bd5d78c749c3af34b52079f0df0d.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_be3a8416736a4c488eee5980e8a82a55.pdf?index=true
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_07a61440099d4b4caa02e19eb3200038.pdf?index=true
    • 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_off0000f46a.bin
b1b733d6dcd41c651d24b99c9f5200ade4dd71601f7ee8dbd3095764b9703bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 1872 bytes
font_01_sfnt_off0000fd5f.bin
9fe9ae6a387746ef6721de1ea68046787cfb881875dbae4ae72e04da6193c8e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 5292 bytes
font_02_sfnt_off00010f54.bin
9f26e37de911fb0e5a8101b4e003e53e3ccf07d834f656846fef2c636aed5507		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 11012 bytes

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