Malicious PDF — malware analysis report

Static analysis result for SHA-256 405121ea36a09743…

MALICIOUS

PDF

82.9 KB Created: 2021-05-07 20:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c4eed1eb8857dd468a0c8a362c5d06a SHA-1: bbbb88574d4b5f2198c85469a08d0e15468d8a5f SHA-256: 405121ea36a09743867a9d11c31d7610408de2aa2c6538bae25b30ba657926d0
196 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are disguised as search results or document titles, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple external URIs strongly suggest this document's purpose is to redirect users to potentially malicious websites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nipisod.ru/strik?utm_term=why+is+blue+light+blinking+on+my+hp+printer
    • https://cdn.sqhk.co/razilipot/jhPKe8v/overkill_s_the_walking_dead_ps4_gamestop.pdf
    • https://static.s123-cdn-static.com/uploads/4454182/normal_5fd0806e92c7a.pdf
    • https://cdn.sqhk.co/jujejorule/jmXighh/47517597470.pdf
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/bunanej.pdf
    • http://jonugofefo.iblogger.org/wodujuzominepugemem.pdf
    • https://cdn-cms.f-static.net/uploads/4418791/normal_604469dbae2a3.pdf
    • http://wubujonil.getenjoyment.net/flushmate_503_not_flushing.pdf
    • https://jezemukefanufem.weebly.com/uploads/1/3/4/7/134765918/e152fae5.pdf
    • https://static.s123-cdn-static.com/uploads/4504922/normal_5ffe448adf092.pdf
    • https://nagajaburelu.weebly.com/uploads/1/3/2/7/132740350/pumuxeguzaguvob.pdf
    • https://fojiwuduz.weebly.com
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fesenobonirizu.epizy.com/certificate_of_conformity_vietnam.pdf
    • http://pidalov.rf.gd/7305317448.pdf
    • https://uploads.strikinglycdn.com/files/9cd474ad-ea76-4c6e-be01-36cd3c6a4907/riselebabimipiximuf.pdf
    • https://uploads.strikinglycdn.com/files/58b4a50f-963e-4e60-b476-a01096e11ebb/literature_an_introduction_to_fiction_poetry_drama_and_writing_compact_edition_8th_edition.pdf
    • https://uploads.strikinglycdn.com/files/95557dcf-2fc5-4251-9f27-d501e843ffb0/tebesenusofopelezofu.pdf
    • http://xipanizi.myartsonline.com/does_the_product_strictly_curls_work_on_straight_hair.pdf
    • https://uploads.strikinglycdn.com/files/f1c3af6a-d8bc-4c62-b683-08627fa0bce1/how_to_determine_stihl_chain_size.pdf
    • http://pejemevogoge.myartsonline.com/lekapuzomoranamuj.pdf
    • https://uploads.strikinglycdn.com/files/bfca071d-999c-48d6-9a01-630909c25a51/onkyo_ht-r560_price_in_india.pdf
    • http://jazupizewatabal.epizy.com/rugexonebulejeguriduta.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_off00010828.bin
e20290d0c73d1e6874649dc7eb89d4a43642ef4b1f1e60f671455311208ed307		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 5344 bytes
font_01_sfnt_off00011a3f.bin
ca0b5e477c530ee9d405bafc7d6a56a56cf72e061f3334de725869ba271beaa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 10488 bytes

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