Malicious PDF — malware analysis report

Static analysis result for SHA-256 de66c9ca87e3c433…

MALICIOUS

PDF

82.3 KB Created: 2021-03-17 01:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3c2e24847113bdd8638981f5fd14c106 SHA-1: 2f7bd05f4063371497e6bbb85a0f308357c10328 SHA-256: de66c9ca87e3c433591dfb878ed4cc40a7b10cdd02603afd691d55da47bdc1c8
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a link farm with numerous external links, including one pointing to a known malicious redirector. The document's content appears to be a lure, using a search query as a pretext to direct users to potentially harmful websites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+much+is+real+estate+school+nj In PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/d4eb5e1fab.pdfIn PDF document text
    • http://tadefog.medianewsonline.com/english_speaking_course_in_gujarati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_6042199bb5149.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/19033030998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474722/normal_5ffd641f4620a.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/rubiwizobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377125/normal_5fc8c44162632.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/doxopobiwegufiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/denidefupuwubatovet.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_54cfec809ae54b60aab5d2fb342eef69.pdf?index=trueIn PDF document text
    • http://nanaxidimidi.atwebpages.com/5053455291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee3d585-5c8c-4379-85fc-e8f2feb2c5d1/23765539087.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_e1fa760bbe96479aa1289d9552315df0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc2b7d2-eb5c-4473-8beb-c92be3997b92/59750141087.pdfIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_07fe182b184e43b091aed01094f19bfd.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_ec0d93b7a0f241ae8b636f4dc1323332.pdf?index=trueIn PDF document text
    • http://gixarewujedel.atwebpages.com/what_is_the_order_of_twilight_books.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/zeputov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808b0da2-5842-4d44-a8d9-4b6da460aa97/cuanto_equivale_7_mm_en_pulgadas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f347e69-840f-4da0-b850-8ef81faa7b48/nulibazisomosulagefare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f701a37-c103-4852-bfc9-7bf515a74e7b/where_does_evil_dead_2_take_place.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_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 5168 bytes
SHA-256: dff727d838079b73c7b3efc32bacb7791b1607b314e9bb48402685e3862c139f
font_01_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 10976 bytes
SHA-256: 0184ea276b5b162ff58b5ae9770e6c5f872489713a1ccb8e16f94b95adca1f9c