Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0f444c91ac7e9c…

MALICIOUS

PDF

74.2 KB Created: 2021-03-19 04:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76ec0b8078e747dbb507f354388ad34a SHA-1: d9cda98b01306cfba743353a80cb84ee6dea4e3e SHA-256: da0f444c91ac7e9c7914cc1236e0156a8adb511259e5963418979da1b7f38b72
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The document body, though heavily obfuscated, contains references to 'Internet bandwidth monitoring software free' and authoring application details, suggesting a lure. The presence of multiple external links, many hosted on disposable domains, indicates a likely attempt to redirect users to potentially malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=internet+bandwidth+monitoring+software+free
    • https://mofugitapab.weebly.com/uploads/1/3/4/7/134728490/7429306.pdf
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/viwaroguxupo_fimuruzu_kixuwozigek_biximoti.pdf
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/fogidasiwo.pdf
    • http://punejew.mygamesonline.org/how_many_paragraphs_is_a_two_page_paper.pdf
    • http://fusobilel.iblogger.org/website_templates_free_html_with_css.pdf
    • https://guxuxexor.weebly.com/uploads/1/3/0/7/130775085/pegukakos_jetesuwawaz_ximumawexusu.pdf
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/xomizimedusiju-mifoxo.pdf
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/zajagefexo_wetipimume_nikafutizun.pdf
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/5089155.pdf
    • https://falototadapi.weebly.com/uploads/1/3/3/9/133989324/c4d61d43.pdf
    • http://bovewitavivebu.getenjoyment.net/87790552774.pdf
    • https://simalono.weebly.com/uploads/1/3/1/8/131856945/zubuli.pdf
    • http://gadivawiw.sportsontheweb.net/sugar_shack_blues_song.pdf
    • https://lumigoxodavi.weebly.com/uploads/1/3/1/6/131606620/713ee21.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://setopuvoxuz.epizy.com/kejolumepexosevazuvesiras.pdf
    • https://s3.amazonaws.com/joterige/5554732149.pdf
    • http://lagidifej.rf.gd/jill_poole_textbook_on_contract_law.pdf
    • https://s3.amazonaws.com/jewizopukuni/does_psn_still_work_on_ps_vita.pdf
    • https://s3.amazonaws.com/numunenoji/wowajas.pdf
    • http://donijexufenu.onlinewebshop.net/advanced_calculus_free_download.pdf
    • https://s3.amazonaws.com/dujepav/word_problems_for_distance_and_displacement_answers.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_off0000e42d.bin
8154d4c2d0f3208e8deefc81e04f6cb6bee383ef845d3db6ec31198c3e38ccb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 5460 bytes
font_01_sfnt_off0000f6a4.bin
977d5884273a00639cf5baf4511b26bc89f7fd2e98d53a1ba8c555383d35fdda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 10808 bytes

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