Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3ef3f3b6739a0d…

MALICIOUS

PDF

85.5 KB Created: 2021-05-04 12:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: da2a0e8159a07dcc822a9fe6ffd3a11f SHA-1: 273851863341ae1b53718842405d051df11d0b47 SHA-256: cb3ef3f3b6739a0d766094b583c1dd611ebf1387b8bffec9d605253b45cb85e9
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution. The document body, though heavily obfuscated, contains references to product sales and appears to be part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=nordictrack+c900+pro+for+sale PDF link annotation
    • http://mesanezedid.mypressonline.com/what_is_the_verse_train_up_a_child.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/employment_acts.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/10293689798.pdfIn PDF document text
    • http://zevupixikug.mywebcommunity.org/7785390908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_6031bc24bf6d7.pdfIn PDF document text
    • http://xelowonol.scienceontheweb.net/25357792355.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/76328410384.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/cask_of_amontillado_questions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447252/normal_5fff9c5ee1a43.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/0817d1c1-e2ea-4f24-9cbc-f702b3a2b275/the_book_of_yes_by_kevin_ward.pdfIn PDF document text
    • http://wewabegig.rf.gd/pumavufilafovet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd449c60-d5fb-4db0-b224-b9f1bce780a9/honda_ez_2200_generator_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e995c03-61a3-480b-ab9b-f7aa7cc6e748/4552522525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538a8195-173c-415a-9a5e-9fed1536b540/telokujasirot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f4de48-d438-4266-b8b2-a7c53164fbf6/madden_16_trophy_guide.pdfIn PDF document text
    • http://sajobovu.epizy.com/17474992092.pdfIn PDF document text
    • http://werujutiweponig.rf.gd/22076942547.pdfIn PDF document text
    • http://dikowipenov.epizy.com/xewizajowojutuj.pdfIn PDF document text
    • http://salajire.onlinewebshop.net/sap_basis_tutorial_point_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3433b31-8388-438a-ac03-d9d8be99a523/wotojunopikinuv.pdfIn PDF document text
    • http://bibekuxamawijoz.epizy.com/jemajelawisomojimowupuk.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_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 5480 bytes
SHA-256: dec7876c3f87c300977b7c8080cdd41ddab3911bded7a7cd90dcf2a4af1548ca
font_01_sfnt_off000122c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 10580 bytes
SHA-256: ca782eb56c8f85d30fb3f51e1b5ddc5adc8843aa03df9214abce9c47e8ad47ad

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