Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fef95c64065d50…

MALICIOUS

PDF

78.0 KB Created: 2021-02-27 18:18:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d8b9b92956a31de63760f73cce991cf3 SHA-1: 5223be3e34a8ed66d7249da269f8f03dc5e607e4 SHA-256: f7fef95c64065d50a943e4b9dfb1f089b95b8c4c73e1da78c42d0c6b60807523
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on 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 a malicious document, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wb?keyword=how%20to%20use%20tiger%20rice%20cooker%20youtube PDF link annotation
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/397386b880.pdfIn PDF document text
    • https://rovepegolotiru.weebly.com/uploads/1/3/4/3/134319415/1860777.pdfIn PDF document text
    • http://tawojuxonivix.22web.org/53895943819.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/83191bdac14247.pdfIn PDF document text
    • https://xonadenot.weebly.com/uploads/1/3/4/6/134685596/ruvakasokututaf-roseniziwezapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_6012f82d8fced.pdfIn PDF document text
    • http://piroxopirov.22web.org/71498868623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fe64d2b83b53.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/46184733093.pdfIn PDF document text
    • http://newowoliso.iblogger.org/bow_and_arrow_games_for_pc.pdfIn PDF document text
    • http://rexasokozeg.iblogger.org/79161819868.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/rofekalifotaxowewinesuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_5fdc0a944bf1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_60143d025681c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurabagoderes.atwebpages.com/79287212455.pdfIn PDF document text
    • http://nufewaruxemo.epizy.com/belahan_jiwa_kahitna.pdfIn PDF document text
    • http://kedogevakubonog.epizy.com/xiaomi_aggiornamenti_android_10.pdfIn PDF document text
    • http://sabinozugi.epizy.com/period_tracker_lite_app.pdfIn PDF document text
    • http://zijevaru.rf.gd/79488177748.pdfIn PDF document text
    • http://lazewimal.epizy.com/shadowscapes_tarot_guidebook.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/33094479399.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_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 5084 bytes
SHA-256: 4c78060cc95b8ceab27d87dbbe361b147c59481b2325908ed5bffbf21292aa6d
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 10480 bytes
SHA-256: a95306f3b438508fa7bbabf3420cf3a714fc38951ba1d3640785cfb4af0bf1f6

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