Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adfafd8355f17cb…

MALICIOUS

PDF

90.0 KB Created: 2021-03-04 18:29:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c529b8629e749cbdfe3119c37659c976 SHA-1: 47f6b81618fb3d80889e987b06aa6488f90f5804 SHA-256: 4adfafd8355f17cbf37184c6f5d1e9dcdbd5bd1c80d7871169d516e5b1f3749d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests the document's primary purpose is to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://yafferge.ru/strik?utm_term=un+curso+de+milagros In PDF document text
    • https://cdn.sqhk.co/xeloxilava/jdhj1GH/94099932381.pdfIn PDF document text
    • http://igme.site/weraxagiwuvc993.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ZQRghhV/74592507706.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5fc7723890bb8.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/uibig66/garfield_kart_furious_racing_ps4_multiplayer.pdfIn PDF document text
    • http://mainsale.pro/2711444955l1hun.pdfIn PDF document text
    • http://lupaper.22web.org/85379379402.pdfIn PDF document text
    • http://nigigalewo.iblogger.org/jibor.pdfIn PDF document text
    • http://banquepopulaire-fr.org/liwukumuzebexosebajuup6sr.pdfIn PDF document text
    • http://gasorutika.iblogger.org/kabbalah_vk.pdfIn PDF document text
    • http://xozawuledol.iblogger.org/use_pascals_triangle_to_expand_the_binomial_d-56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471960/normal_5fd66126b41e3.pdfIn PDF document text
    • http://formverifiedbadge.com/dumbbell_and_barbell_workoutsfd87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevivudawof.epizy.com/filter_two_excel_spreadsheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b3a551-7297-464f-b8b4-0b1dd9cbd68f/xonufurobefijux.pdfIn PDF document text
    • http://fenozenexow.epizy.com/jumimofafamaxuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6079951b-6af6-49af-b126-c7f9f982330d/marvin_harris_cows_pigs_wars_and_witches_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c00090c-a375-433a-b7a5-eec06a89fdcd/wurijakajofuxedofoteti.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_off00012117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 5252 bytes
SHA-256: ef35aaee285fa962ae2bb6a3689063face5b223d5a2157cbe1a3646e8a5bc6ca
font_01_sfnt_off000132d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D9 11976 bytes
SHA-256: e8d53e5687960511acd6c7f2bea1675cef58aae168356d1986b11877d8c915c4

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