Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4c86690418295f…

MALICIOUS

PDF

75.1 KB Created: 2021-03-11 16:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab66fa78a383bac14ff97ff907fade03 SHA-1: b651c0bd3bbed3977038b9cd94e113911dd63e85 SHA-256: 9d4c86690418295f84f60935f106f9ef5d65a91202e906b81d4d6f2a2563acbb
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm designed to distribute malicious content. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly suggests malicious intent. While no scripts were explicitly extracted, the structure and link farm nature are indicative of a phishing or redirection campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/wix?keyword=productivity+and+the+carbon+cycle+worksheets In PDF document text
    • https://cdn.sqhk.co/ferobisuw/fkdhf7V/junewirusofugugiriwete.pdfIn PDF document text
    • https://cdn.sqhk.co/dojaxeje/pAghVhi/1st_year_english_moral_stories.pdfIn PDF document text
    • https://natutiwuv.weebly.com/uploads/1/3/6/0/136019317/3558447.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/02jcShb/70616838935.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/DhHgdjb/muxujugowudamogik.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/importance_of_audio_visual_aids_in_teaching_learning_process.pdfIn PDF document text
    • http://pezesukuju.iblogger.org/flat_bed_sheet_in_spanish.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/50826700979.pdfIn PDF document text
    • http://manekobe.22web.org/vubogale.pdfIn PDF document text
    • http://laditosos.iblogger.org/37294466953.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/ccc006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rugeritubaduw.epizy.com/american_college_of_rheumatology_guidelines_for_ra.pdfIn PDF document text
    • http://konemuga.epizy.com/wumutelurup.pdfIn PDF document text
    • http://luxotenudiwuzu.rf.gd/97631829001.pdfIn PDF document text
    • http://zujisofivo.onlinewebshop.net/jeliboxufawanejukebig.pdfIn PDF document text
    • http://kejakum.rf.gd/89373911626.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_1b548e6223354174a9846743855f38d1.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_e61f8a22082e4466b39b42c9d0e5492b.pdf?index=trueIn PDF document text
    • http://buzanokekeb.epizy.com/loto_equipment_specific_procedure_template.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_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 5488 bytes
SHA-256: d56bbd8c65c00727983e1089f41b687f9641123801942879b66eb5ce80b8b727
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 11224 bytes
SHA-256: e1b3e8a9c85410d602caeefeaa76b6a5231e5a07737b500453c079b9ce238c25

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