Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f5fd282cd0f164…

MALICIOUS

PDF

75.5 KB Created: 2021-02-26 19:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 22b498184a2860e9a52093cc1343a353 SHA-1: db17f9c4b70bb5a37640388f6c61d05b1b80cbe8 SHA-256: 76f5fd282cd0f1643e702b7a53beac3cb39ebaa92671678ef5794909da825421
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=the+other+side+of+midnight+dvd PDF link annotation
    • http://rijewomel.scienceontheweb.net/saredakarusedosogejo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382412/normal_5fcd95d4e81de.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/lufutefizorodoledo.pdfIn PDF document text
    • http://islta.fun/wingstop_locations_mapldqd8.pdfIn PDF document text
    • http://raicen.com/punjabi_bass_boosted_songs_mp4bg36c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_6034419182fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497356/normal_600a03d4de0e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5ff8607c1f105.pdfIn PDF document text
    • http://fapseo.ru/how_to_tell_if_ac_expansion_valve_is_bad77yld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_600d54dd40473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_60145d26a6698.pdfIn PDF document text
    • http://3gusevshop.website/rs_party_hatsd5a5r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwakitidi.onlinewebshop.net/garmin_nvi_2597lmt_update_problemen.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/philosophy_of_science.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/nada_carmen_laforet_resumen_y_analisis.pdfIn PDF document text
    • http://wutagokavejeve.rf.gd/12124151859.pdfIn PDF document text
    • http://paruwegugu.rf.gd/luzanufojito.pdfIn PDF document text
    • http://sedoguzod.rf.gd/7086104423.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_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 5088 bytes
SHA-256: 42eaf8a8485ea64725d0d5998b485b098666f75974a1a095f3c8b7f5b66b8c1a
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 11512 bytes
SHA-256: 4d3b498c794fd24e2dc5e1106dc672338dcc96cc4260a3da2b51e42b0660e483

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