Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efc31dce77c10c8…

MALICIOUS

PDF

67.0 KB Created: 2021-03-02 02:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f39bcf6f75df305ffa52f9e50b610abd SHA-1: 515d3bda454ecf4578398f8fdd07119307d1b0f0 SHA-256: 3efc31dce77c10c86f359a18e2b9b9fa75f1624beae52f4952506ad380446ec9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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
  • 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://pelibifir.ru/wix?keyword=vocabulary+workshop+level+h+unit+2 PDF link annotation
    • http://sezewadiwun.22web.org/dragon_age_inquisition_romance_guide_josephine.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/vizio_e420i-a0_will_not_turn_on.pdfIn PDF document text
    • http://kogutipabu.22web.org/pioneer_avh-270bt_wont_connect_to_bluetooth.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/38422491494.pdfIn PDF document text
    • http://ufenmac.com/wokenibexarezojonip34bh.pdfIn PDF document text
    • http://sodahq.pro/jofijadukasomukigodcpe0z.pdfIn PDF document text
    • http://kleomaften.online/lemon_cake_recipes104m8.pdfIn PDF document text
    • http://bavavemerit.22web.org/81381087814.pdfIn PDF document text
    • http://xiredanu.22web.org/global_automotive_industry_report_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novabimakokoj.rf.gd/ejercicios_resueltos_de_movimiento_caida_libre.pdfIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/30433060269.pdfIn PDF document text
    • http://zilazop.rf.gd/wwe_night_of_champions_2019_bleacher_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/bahubali_1_cinema_telugu.pdfIn PDF document text
    • http://livirava.atwebpages.com/perazujakevexerixedokosat.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/jegosevitusilaloniporites.pdfIn PDF document text
    • http://gopasupefiden.epizy.com/mcafee_antivirus_free_for_mobile_phone.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/18795229627.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/dcfs_louisiana_abuse_report.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_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 5576 bytes
SHA-256: 6298f7c234ccf1ae2929badd58a88748e2431bdefe5e667a2b80c07699dac5be
font_01_sfnt_off0000dd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 9924 bytes
SHA-256: 2912da235762ccf74ecbdfe0917e6cdcbd6a05a1e7c953e198e5de2afe6abd82

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