Malicious PDF — malware analysis report

Static analysis result for SHA-256 872efa8e04dd6e5a…

MALICIOUS

PDF

76.6 KB Created: 2021-03-05 19:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 17be5f35ce13f6189ab5632fbd0b88c5 SHA-1: dd40d713fa080f460cc89ece93030bc125a95e37 SHA-256: 872efa8e04dd6e5aa54534c892a6ca329f8b0ddad650eb38dee5e23f4f58716f
146 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=polaroid+300+instant+film+camera PDF link annotation
    • http://bubuwem.iblogger.org/epic_cricket_game_for_android_mobile.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/pupewuzixolutoz.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/75279310641.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/serid.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/fagifumigifironuf.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/sacred_geometry_art_meaning.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/fire_and_ice_facial_cost_in_india.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17621d0-74a1-42d1-b0f7-ccf16798dfcd/trevor_noah_book_goodreads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65234773-e65e-4a82-9157-9a16a56cba8e/masterbuilt_electric_smoker_assembly.pdfIn PDF document text
    • http://mebijido.rf.gd/lolajopuvenu.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/creating_shared_value_porter_summary.pdfIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_a47651642dc34e588bc93f9f4ce78a10.pdf?index=trueIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_8ffbda123a3b4054b6227b8712260a5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roxawo/11498052202.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/39090780231.pdfIn PDF document text
    • http://zukixewagiv.epizy.com/latest_nora_roberts_books_2020.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_a1501c7fd81c430095a7560396c12bc6.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_9023c2c3a1a1467c87ca74da9d4825c7.pdf?index=trueIn PDF document text
    • http://muwumatenenuli.rf.gd/1320653048.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 5476 bytes
SHA-256: e893a1c369d4a87a24063c98c1ffa178056eb94acaf0c0deb958f626cebf58d2
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10868 bytes
SHA-256: 0d76bd0eb937324a49287e5f7d405f3cf87ba1563067be6641b977e12fed5710

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