Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04e2ca5b22c7a7f…

MALICIOUS

PDF

77.6 KB Created: 2021-03-31 00:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90527ed7a1919a79d214bf62549c8dcc SHA-1: baf72bb972828af04cd2d2207694e1e209d0ab4f SHA-256: a04e2ca5b22c7a7fc5da4a6a21aa6233600ba66d2559660c000dad0a8fd23b04
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=shakespeare+worksheets+ks2
    • https://cdn.sqhk.co/topazawu/eQEGijf/free_photo_editing_app_for_laptop_windows_10.pdf
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/vakiwafimisot.pdf
    • https://miwolugakibu.weebly.com/uploads/1/3/1/3/131383652/telinebu_dijon_febanowisexim_giduxena.pdf
    • http://vittorguxx.site/22415221021v724k.pdf
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/425879.pdf
    • http://makedctl.site/sevazolitatujasivuwdfv1s.pdf
    • http://lejidakoxinetog.mywebcommunity.org/why_is_my_2014_chevy_malibu_overheating.pdf
    • http://dipenoguzel.sportsontheweb.net/38673417600.pdf
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/594248.pdf
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/87fdff.pdf
    • https://cdn.sqhk.co/nurijodefa/dm04Vhh/irvine_the_great_park_certified_farmers_market.pdf
    • https://garotilalu.weebly.com/uploads/1/3/0/7/130739336/1867505.pdf
    • https://cdn.sqhk.co/bemapebe/mzjjcje/38093219959.pdf
    • https://fubuzupa.weebly.com/uploads/1/3/5/3/135324320/bivug.pdf
    • http://help-service-support.com/81290062713ofxyj.pdf
    • http://lamanixumerad.mypressonline.com/how_to_set_up_homeworx_digital_converter_box.pdf
    • https://debugifepini.weebly.com/uploads/1/3/1/0/131070476/7957613.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_66be8ce5a8794823a484722af30f7c4c.pdf?index=true
    • http://leparitupoxow.onlinewebshop.net/aggregate_functions_in_mysql.pdf
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_8515ce7f56b8485e95bc41c7604ceac5.pdf?index=true
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_245dda3f26864c5aa0d4317a45be78b6.pdf?index=true
    • http://mifojizu.myartsonline.com/chronicle_of_a_death_foretold_chapter_1_analysis.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_off0000f115.bin
426104444201df21945f61ef9b9342ad55dcc3f469f52652c640c57de0495056		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 5268 bytes
font_01_sfnt_off0001030b.bin
35ff8fe07aac77691186bf7bcc3337e595aadd0faa0f2187025b4d5686b94c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 11252 bytes

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