Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7c7e492ac59b04…

MALICIOUS

PDF

75.7 KB Created: 2021-02-22 14:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4acc66faa114bd2c9c17fa40c8a7570b SHA-1: e4fe6486bf599ac0bbd5fafec76893f32abf9f42 SHA-256: 5f7c7e492ac59b04b15c0aa01e72f84c5d8f5d74fa5c24a3063ebb028a1861dc
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of a malicious URL is a high-priority indicator for a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://crophysi.ru/123?utm_term=realism+vs+naturalism+philosophy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_6019983756bec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376371/normal_5fec9d2b81a22.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxumisi/kbnaghd/48727806760.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/zikub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_600d8a19cc3c2.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/2922207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465125/normal_5feffd1103cb9.pdfIn PDF document text
    • https://baduzasozem.weebly.com/uploads/1/3/1/4/131407439/romogiteposepudako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_602437af702f1.pdfIn PDF document text
    • http://sandiego-podcasts.com/13421805897vhxo7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fee468483667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370302/normal_5ff34c6a55f0b.pdfIn PDF document text
    • http://13millions-warzone.store/transmission_fluid_change_cost_honda_pilotvw32u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_601eebbbc2600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471091/normal_5fec84cbc17f0.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/jehbicg/christmas_snowball_fight_game_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/poresi/report_illegal_immigration_workers_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/75299866550.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/corpus_christi_cranebrook_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/52801636823.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 5112 bytes
SHA-256: ba5e5a2a3dc3f7c50d9d39be19e81ccbc10e12486a931843e52fed2ed1d1b907
font_01_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 10200 bytes
SHA-256: 3e54ae5dc298870a59ef1ab1f6f50c134223daf22514c738185c8f2b4ca09f56
font_02_sfnt_off00011167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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