Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c9581d368be83d…

MALICIOUS

PDF

74.2 KB Created: 2021-03-20 08:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b526bb42b566f66ed7bdddfd8dc674f8 SHA-1: e51dab5706e1590874b4279f5e6d71f17e07cb63 SHA-256: a1c9581d368be83d65fafa4e39700719743e35116136847d7723c27583f1307d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one pointing to 'resalured.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://resalured.ru/wix?keyword=reddit+deontay+wilder+vs+fury+stream PDF link annotation
    • http://zoomita.fun/65531713469neokz.pdfIn PDF document text
    • http://dronextactical.xyz/rewofirakamasowegogowumad3m0da.pdfIn PDF document text
    • http://shoop-ff.ru/9538731111949ab3.pdfIn PDF document text
    • http://chtotakoebezuz.biz/a_smarter_way_to_learn_html__css_download77sje.pdfIn PDF document text
    • https://cdn.sqhk.co/xebibugekux/iemLrAs/lg_ck43_300w_xboom_review.pdfIn PDF document text
    • http://copyrightsupporteds.com/769991443640lbaw.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/tazudenuboxubanawnibz5.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/lujabaxipodo.pdfIn PDF document text
    • http://vladport.ru/julius_caesar_act_3_scene_1_summary_and_analysismxb68.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/all_of_me_piano_sheet_easy.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/zowomuk.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/Gjienhe/shark_live_wallpaper_apk_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_438df6fd3bfc470db74d9ba54d7f00d4.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_a37368e3334e4da4b757162bdaca4e34.pdf?index=trueIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_d558520f19964fd4b44021b33b80a6bc.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_528aae57ca43472c87b9f82010fd51f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/renupodepozox.pdfIn PDF document text
    • http://gegetebipa.atwebpages.com/diploma_in_business_administration_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/twinkle_twinkle_little_star_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/2532385595.pdfIn PDF document text
    • http://gototura.myartsonline.com/building_classic_physique_natural_way.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_8bb286e3621d4d849150120fb7a1564c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 5316 bytes
SHA-256: 3cf1beed9de8159b5c1421c61b63ba9809181aaac8aa756e120428e4dee5865a
font_01_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 11276 bytes
SHA-256: a244fa64b98147d84bbb9480e7ec6277fc890a994ec3bf5782fb92dbfb06427f
font_02_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb