Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cd1e07278c28cb…

MALICIOUS

PDF

72.8 KB Created: 2021-02-26 11:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 208d2d58b372ccdb7586111aad232044 SHA-1: 497e9ec43e73ef9696643b501e5284068d8f8f67 SHA-256: d6cd1e07278c28cbdbf6e975b0142ee0ab102d917888760067edf2eb39916efb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm structure suggest an attempt to drive traffic to potentially malicious sites.

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
  • 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.
  • 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://baarspo.ru/wix?keyword=concentracion+de+soluciones+ejercicios+resueltos PDF link annotation
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/nitamezitifo-lulapafupewuxog-ratog-pasidimupig.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/gfgijfe/telidazojexowixajabeveg.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/chbgcjh/26734400286.pdfIn PDF document text
    • http://aromaita.space/temaparatodasivivomigmopdu.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/eoelheB/descargar_fall_race_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/h3hhchb/deredakolojibupuzajedalup.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/OG1jeRj/the_cw_seed.pdfIn PDF document text
    • http://marabape.iblogger.org/99021593264.pdfIn PDF document text
    • http://pumba.fun/diploma_resume_format_freesww3c.pdfIn PDF document text
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/tifuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezexebu.rf.gd/how_to_set_heating_timer_clock.pdfIn PDF document text
    • http://nobufep.epizy.com/acrobat_reader_10._1_2_free.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/rawagukifovexajiduv.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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 4916 bytes
SHA-256: 618629ac5988cca377123fa18de41f8c91323c44227f73e2e7ba4b83ccaf86d3
font_01_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 11820 bytes
SHA-256: b49232c141ea9831c330a3b87fc636ec657826aad550cf071dde609658fb164f

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