Malicious PDF — malware analysis report

Static analysis result for SHA-256 83341d7526ea2242…

MALICIOUS

PDF

170.0 KB Created: 2021-03-19 21:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 026f134fdda06540f8256f75a0b5943d SHA-1: 22e6be32935b28a187e5897378466d9ca5b61474 SHA-256: 83341d7526ea2242b06c8e6de4c191e3fb9502f37443a1b2c753a72bed44b2fd
126 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/wix?keyword=nimitz+elementary+school+rating PDF link annotation
    • http://vetebozo.mypressonline.com/best_veronica_roth_books.pdfIn PDF document text
    • http://tesepaxe.iblogger.org/68482503112.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/how_do_you_take_apart_a_keurig_2.0_to_clean_it.pdfIn PDF document text
    • http://afterdealer.pro/19508526247otf3c.pdfIn PDF document text
    • https://zuvagojajom.weebly.com/uploads/1/3/5/3/135398962/fegawavuledada.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/best_business_analytics_courses_in_india_with_placements.pdfIn PDF document text
    • http://xadexawufomovi.sportsontheweb.net/lofosorabamu.pdfIn PDF document text
    • http://bio-ita.fun/invisible_man_chapter_26_summaryjane2.pdfIn PDF document text
    • http://tukopugamimepeg.22web.org/19459468652.pdfIn PDF document text
    • http://xekaleduwam.iblogger.org/dujuzudefeti.pdfIn PDF document text
    • https://pokotozumunas.weebly.com/uploads/1/3/1/4/131453498/517d74f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_d46eb41ed19c4950b86485dbabb9d371.pdf?index=trueIn PDF document text
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_d395dec1690743c4913517980cbe53b7.pdf?index=trueIn PDF document text
    • http://loratozojakin.epizy.com/chrome_for_ubuntu_14.pdfIn PDF document text
    • http://rawegutidum.onlinewebshop.net/anemia_defisiensi_asam_folat_pada_ibu_hamil.pdfIn PDF document text
    • http://xudowavujajewof.epizy.com/72576622741.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_off00026331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26331 5336 bytes
SHA-256: cc3c9f103a10ddefc98a266392954782ea70bb7b557174c3c16d075ac76be3f5
font_01_sfnt_off0002753f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2753F 11116 bytes
SHA-256: 6f0bf72038513bdc34450f2c4ebc9d26c99a1c763abb99c36857a636bf8c38db

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