Malicious PDF — malware analysis report

Static analysis result for SHA-256 901f1e5850ec848b…

MALICIOUS

PDF

82.2 KB Created: 2021-03-02 21:32:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8f7e39cbb67f42dd68b307e2d2c3a270 SHA-1: 905ab62a29ce919398d67573955d330587ce21c8 SHA-256: 901f1e5850ec848be3b0e18b5e06a24728035de9acc22d629460120684fcaaec
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the presence of external URIs is a strong indicator of malicious activity.

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://nipisod.ru/strik?utm_term=zoom+recorder+h4+pro PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370074/normal_5fe06946de9a3.pdfIn PDF document text
    • http://hhizmet.com/49255075313lrabg.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/231776702.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/jitol.pdfIn PDF document text
    • https://lamamamim.weebly.com/uploads/1/3/1/6/131606140/dfa73f1.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/8gijdig/free_country_radio_jingles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_602510a9a4b3c.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojonujaj/xjjjgi3/70908920078.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/52953095332.pdfIn PDF document text
    • https://lafajadisevo.weebly.com/uploads/1/3/1/4/131454770/61b4368fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fd67c2d10eb7.pdfIn PDF document text
    • http://dressnbuy.com/lorimovw7t3p.pdfIn PDF document text
    • http://lalashoppen.online/mutants_and_masterminds_3rd_edition_deluxe_heros_handbookwrs1s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_6025cd49cb4a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zizene/vukakowesodusek.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_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 4936 bytes
SHA-256: 17c96cb856a178f8bb61d45c7993e6ee9a18d09ce5ec1278da9d87dc2ddaf1b6
font_01_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 13900 bytes
SHA-256: e330515524e16095f6f656919295c975e38b02fd83da7b9a99fac594c004bb76

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