Malicious PDF — malware analysis report

Static analysis result for SHA-256 e483fb6c14b4886d…

MALICIOUS

PDF

74.7 KB Created: 2021-03-01 03:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a6524b8c6806279924444d1d9f881043 SHA-1: 3d7491877a95138cfec2598a2c643f4758b9fd24 SHA-256: e483fb6c14b4886d8ee4568b59f7b79fe1375aa2bea12d3c0008083a99481315
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 and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to a phishing domain. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xajibur.ru/strik?utm_term=starting+your+own+cleaning+business+how+much+to+charge+uk PDF link annotation
    • http://itdiscounts.pro/mrs_funnybones_reviewslbi7.pdfIn PDF document text
    • http://jushq.pro/how_do_i_get_a_private_investigator_license_in_texasmx646.pdfIn PDF document text
    • https://nifebupamej.weebly.com/uploads/1/3/1/6/131607321/5931081.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428038/normal_5fe5fa69983e5.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/eOhbgcn/wujokaragikepijixe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_60001f32d116a.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/f5757.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/korol.pdfIn PDF document text
    • http://damvglaz2.xyz/57903908911mwoiv.pdfIn PDF document text
    • http://copyrighthelp.info/21519988912e6adf.pdfIn PDF document text
    • http://azorocheat1.xyz/descargar_exitos_pop_90_espanoltcxln.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojofamukasefi.rf.gd/63876262272.pdfIn PDF document text
    • http://gugitetororu.rf.gd/good_writing_topics_for_high_school_students.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/70781568997.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/arduino_mega_2560_manual_espaol.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/imperative_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/striper_fishing_report_lake_hartwell_sc.pdfIn PDF document text
    • http://lutebidazidun.epizy.com/74008798357.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_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 5716 bytes
SHA-256: 1dd00345aa92dca0c802e6a15be5be6fe2315cfb1a06988243a333ab4f098fd4
font_01_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 10800 bytes
SHA-256: b02d0b4190da76616dd106a05a47583a2dcdf434f544197f84082ddd8735d74e

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