Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70ddb2aa6184010…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 14:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18a44b4461d7b372a41a1fe11ddafb6a SHA-1: dc4e73d6561febcc40b7a28ddb280e2d32628dc0 SHA-256: d70ddb2aa6184010f34651abfc5b873d9173590e7fdb77921239bc801f41ac89
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. 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 0.9967

Heuristics 5

  • 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://jacksth.ru/strik?utm_term=what+is+the+fruit+of+the+poisonous+tree+doctrine
    • http://tuwukadinem.mygamesonline.org/list_of_the_73_books_of_the_catholic_bible.pdf
    • http://gemofesane.medianewsonline.com/momiba.pdf
    • http://palejep.22web.org/litamone.pdf
    • http://vanimerukaguto.scienceontheweb.net/65591123907.pdf
    • http://vugekowuzujed.scienceontheweb.net/39225320417.pdf
    • https://xevivipemasap.weebly.com/uploads/1/3/4/4/134481894/16662.pdf
    • http://jujukakajita.iblogger.org/craftsman_18_inch_42cc_chainsaw_parts.pdf
    • http://pifedalune.medianewsonline.com/placental_retention.pdf
    • http://jukojadijomefar.medianewsonline.com/keurig_2.0_k200_instruction_manual.pdf
    • http://samabev.iblogger.org/41299682455.pdf
    • http://zokidinodajives.getenjoyment.net/82991370392.pdf
    • https://wexasubofuxumeb.weebly.com/uploads/1/3/2/7/132740188/2881400.pdf
    • http://setopin.mypressonline.com/micrometeorology_in_agricultural_systems.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xizevobawilu.epizy.com/lijikijaxuzused.pdf
    • https://s3.amazonaws.com/xeropizuwe/givuta.pdf
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_65c1582a3d054a558b8bcd32d3a39854.pdf?index=true
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_6a199c1cebd941e999ffd0f03a341d24.pdf?index=true
    • http://wegepuzil.epizy.com/bk_murli_today.pdf
    • https://s3.amazonaws.com/wovugi/how_to_use_ergo_360.pdf
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_00e41f753dcd4f6f994f66a2b867c053.pdf?index=true
    • https://s3.amazonaws.com/wifiduxezo/spray_and_pray_cheat_sheet_prestige.pdf
    • https://s3.amazonaws.com/dowavelaxam/fekogifowizibubutososose.pdf
    • https://s3.amazonaws.com/zifilobesumafi/bensham_manor_school_uniform.pdf
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_f215676031614db58976e4bc774e8107.pdf?index=true
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_edc3603233e34169822c078916a7e4de.pdf?index=true
    • http://sulijugofogim.onlinewebshop.net/dolizagejupat.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_off0000f6bc.bin
c96379cc67ec40f3bbdab049df15d22228d94ab82897aea86f9328430b9cfba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 5224 bytes
font_01_sfnt_off0001088e.bin
8f033c4873141158312cf08905a19dec2dd25cc569a87cacec264d82988db95f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 10904 bytes

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