Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34da3bc68cc3a0e…

MALICIOUS

PDF

78.8 KB Created: 2021-03-06 10:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e86997cde8add32b3d5074379031da3d SHA-1: 539a7d38e21fbb3a17d81ae268b1637efb100bc8 SHA-256: c34da3bc68cc3a0ea47ef7022e1f104f7f99b49ea4fbcc0b68b448de9b6c952c
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URIs, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=pioneer+ddj-sb3+serato+dj+controller+case PDF link annotation
    • http://xedeporib.medianewsonline.com/the_graveyard_book_neil_gaiman_synopsis.pdfIn PDF document text
    • https://nikizatul.weebly.com/uploads/1/3/5/3/135309179/9612646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_603705747cfd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454055/normal_6042eb4d20bf7.pdfIn PDF document text
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/kufixasisatokigil.pdfIn PDF document text
    • http://vajimojuregal.22web.org/jozobi.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/45938271441.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/java_8_download_32_bit_windows_7_filehippo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_6027e526916fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455660/normal_5ffa0f339902a.pdfIn PDF document text
    • http://xugafigipi.22web.org/50737522847.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/9192971.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetobagog.rf.gd/euro_pass_cv_english_template.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/kiwisukosaxugodujopup.pdfIn PDF document text
    • http://jokosen.atwebpages.com/gufadisoxexarujizutup.pdfIn PDF document text
    • http://nilifujajug.epizy.com/chestnuts_primary_school_ofsted_report.pdfIn PDF document text
    • http://butorinowu.myartsonline.com/russell_index_calculator.pdfIn PDF document text
    • http://laxaguwen.epizy.com/biolase_epic_10_user_manual.pdfIn PDF document text
    • http://gobozukelawi.epizy.com/psilocybe_azurescens_trip_report.pdfIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/68933067359.pdfIn PDF document text
    • http://fexotupakel.rf.gd/types_of_literary_analysis_theories.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_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 5348 bytes
SHA-256: 7628aba35735219b39712948368c0dc8c1952c052cdf05048f9125bb6362169c
font_01_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 11068 bytes
SHA-256: 08b0ad4cd73907010d2af34b7ef526c5d0030f9baf21380d4344a5d07e7ecc75

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