Malicious PDF — malware analysis report

Static analysis result for SHA-256 103fa5f86ff1e2dc…

MALICIOUS

PDF

72.4 KB Created: 2021-04-26 15:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c6fd78409183f9063218376b23f97d0b SHA-1: 86c76a9e718a4498730bb2efa7c7fa84789d6c94 SHA-256: 103fa5f86ff1e2dc4baf73c5d2c19b5c8258c5c6a9b0ad8ddec01b1d5378d078
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also flagged the document as malicious. The presence of MFA lure heuristics suggests an attempt to harvest credentials or session tokens. While no scripts were directly extracted, the PDF structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://dafemum.ru/strik?utm_term=lexus+es300+battery In PDF document text
    • http://nout-prodat.site/gadupezaxofabutur6eoh8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_603b68b2b0ae9.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/eigjijf/roxekiweruwup.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/tinkle_magazine.pdfIn PDF document text
    • http://titoto.xyz/52852228462xod0m.pdfIn PDF document text
    • http://modernstyle.pro/gexujipisivivafepitasodf9ntf.pdfIn PDF document text
    • http://manibupefif.mypressonline.com/sarcoplasmic_hypertrophy.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/why_wont_my_hedge_trimmer_start.pdfIn PDF document text
    • https://cdn.sqhk.co/vigibizez/Inbljcd/deckeleven_s_railroads_mod_apk.pdfIn PDF document text
    • http://lg-supportteam.com/grade_3_worksheets_english_depedssua2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_5fe64540260dc.pdfIn PDF document text
    • http://polfact.site/rizakovogovokuwenujolexogjyg39.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/cisco_ccna_security_210_260_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojibikifi.myartsonline.com/galujijukexiziziru.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/47717250231.pdfIn PDF document text
    • http://zorikeroz.onlinewebshop.net/beditizuwirin.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/vomaxasabomiwojaf.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/korean_language_translation_in_english_alphabet.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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 5204 bytes
SHA-256: 7448224d25420f68f437ba1c4d544b786154f7c86dca28e66998771b87425e8b
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 10984 bytes
SHA-256: e2bc224fcec00b48878438cfeb3833c3917e505e5ef9eccf7a2fa34966af5215

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