Malicious PDF — malware analysis report

Static analysis result for SHA-256 68097ca89e1da013…

MALICIOUS

PDF

78.1 KB Created: 2021-05-19 22:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f95ef25ab7454df85a3b7d4db482024 SHA-1: 99281062de412ea25f8f8250b9877b62ce9919ae SHA-256: 68097ca89e1da0135a6d2e812f1b817a3e813c90122e7454262dfa48783df88d
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links embedded within the document. One of these links, 'https://jacksth.ru/strik?utm_term=primo+levi+the+gray+zone+summary', is directly referenced. The presence of numerous external links, many pointing to PDF files hosted on platforms like Weebly, suggests an attempt to manipulate search engine results or redirect users to potentially malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=primo+levi+the+gray+zone+summary
    • https://zanonolupurezo.weebly.com/uploads/1/3/3/9/133997165/sukanobivuvanowin.pdf
    • https://leruvipox.weebly.com/uploads/1/3/5/3/135347136/71bacd.pdf
    • https://gomibabojusul.weebly.com/uploads/1/3/1/4/131483197/tisisovid.pdf
    • https://cdn-cms.f-static.net/uploads/4488314/normal_606a5fef9b5cf.pdf
    • https://tivumujodul.weebly.com/uploads/1/3/4/6/134608740/pexababaful.pdf
    • https://cdn-cms.f-static.net/uploads/4495264/normal_60669d04dd824.pdf
    • https://cdn-cms.f-static.net/uploads/4444374/normal_6067f04acc215.pdf
    • https://cdn-cms.f-static.net/uploads/4403262/normal_6049eb0cd30b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dc91dcec-a259-44ac-9661-34a14998bd6f/2016_ap_calculus_ab_free_response_answers.pdf
    • https://uploads.strikinglycdn.com/files/1a6e15cf-d554-48cf-8678-97e6356aee0d/pazamawavobotajigalame.pdf
    • https://uploads.strikinglycdn.com/files/79f5c1cb-6d20-4466-b3dc-837b731eefbc/arbonne_pumpkin_spice_protein_shake_recipes.pdf
    • https://s3.amazonaws.com/julaxel/android_studio_install_ubuntu_16._04.pdf
    • https://s3.amazonaws.com/jesidofefe/answer_to_daily_jumble_today.pdf
    • https://uploads.strikinglycdn.com/files/73360bbf-5bdf-4b0a-b5b5-a66593becf09/zuzemofun.pdf
    • https://s3.amazonaws.com/gonima/wotuzigediso.pdf
    • https://s3.amazonaws.com/rizezobabub/icivics_one_big_party_worksheet_answers.pdf
    • https://s3.amazonaws.com/desenaz/53843417404.pdf
    • https://s3.amazonaws.com/zuses/graphing_quadratic_functions_worksheet_answers.pdf
    • https://s3.amazonaws.com/xefezesebusu/limisukutitelen.pdf
    • https://uploads.strikinglycdn.com/files/466de561-ccd0-4df7-9bdd-af6351c44a62/pupigaxuxu.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_off0000f033.bin
cc75ee5b66a96d3badc4206f8aad019164819328e5ae7ed31f199601f2ca3d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 5312 bytes
font_01_sfnt_off0001022d.bin
5a524d5435343036bff29c78137ba64128ff83c0ff69338198c87464b686a6a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 12576 bytes

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