Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fb779c8b4dde5e…

MALICIOUS

PDF

79.4 KB Created: 2021-03-04 12:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9185f5dc086ba76753987ed8cbfbc088 SHA-1: eeacf495e7fa8c7662142b049e341320af897fce SHA-256: c4fb779c8b4dde5ec8b9bbd887bedabeecc1ab892bb02e8fa84f422f30bd2cde
166 Risk Score

Malware Insights

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

The PDF contains multiple suspicious and invisible links pointing to external domains, identified by heuristics like PDF_SUSPICIOUS_LINK_LURE and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://soxebez.ru/strik?utm_term=the+elements+of+user+experience+user-centered+design PDF link annotation
    • https://rixabala.weebly.com/uploads/1/3/4/7/134730828/e68f5.pdfIn PDF document text
    • http://futup.ru/88378928081ku03f.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/4836732.pdfIn PDF document text
    • http://afracheat7.xyz/kabegogoxawidr4c0v.pdfIn PDF document text
    • http://sekijad.iblogger.org/vituzusejipuxadeb.pdfIn PDF document text
    • http://apkweb.net/3142774954551pek.pdfIn PDF document text
    • http://delavivajew.22web.org/gala_dictionary_english_to_gujarati_free_download.pdfIn PDF document text
    • http://ig-supportcenter.xyz/cctv_daily_monitoring_reportnagkv.pdfIn PDF document text
    • http://hookup753.fun/reply_to_interview_invitation_templateoux77.pdfIn PDF document text
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/rusiworivijarorabefo.pdfIn PDF document text
    • https://vulefewaxamovu.weebly.com/uploads/1/3/3/9/133997320/9914840.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/iejbLja/34561852081.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/1MidSgg/unlimited_gun_for_hire_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/cXGidih/552838096.pdfIn PDF document text
    • http://chelamela.org/what_is_an_involuntary_alienation_of_propertycl3ry.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vamavom.epizy.com/new_yorker_crossword_december_30_answers.pdfIn PDF document text
    • http://redusaboj.epizy.com/watch_war_horse_play_online.pdfIn PDF document text
    • http://jeronegiwok.rf.gd/21179454675.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_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 5408 bytes
SHA-256: ca5bd95cfbd35d02e682e9fc380825a54aec5f1f8ea24c123513c8895721f54c
font_01_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 11276 bytes
SHA-256: 68945a8f17686bc1f0892aa51e9ef618222de07f968e318915eca1caa79f2208

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