Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33b6a1394c2934d…

MALICIOUS

PDF

75.3 KB Created: 2021-04-30 08:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fb21934ac49d0ed0876984c7137ea6b4 SHA-1: 59e69f97eb4f411e7fa6c91b0d65662350bfdf06 SHA-256: f33b6a1394c2934d9503985af1969a2284987d0954f77588e3e52924e25f8f93
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various disposable domains, likely for phishing or malware distribution. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=learning+radiology+recognizing+the+basics+william+herring+free+download PDF link annotation
    • https://cdn.sqhk.co/mekurapiw/ahgbjho/country_music_female_singers_2020.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/gujedalobezuxos.pdfIn PDF document text
    • http://azules.ru/monstrous_nightmare_name_generatorl8yxt.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/hdgWuie/download_drift_x_burn_mod_apk.pdfIn PDF document text
    • http://hookup154.site/kujulefegewokoxydxa.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/61187907659.pdfIn PDF document text
    • http://xebupado.mypressonline.com/33678583648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_605071e6bb319.pdfIn PDF document text
    • http://mosquito.codes/458734102768eng2.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/dieNKhi/72919759387.pdfIn PDF document text
    • http://shopwithsale.website/big_nate_blasts_off_summarypfr21.pdfIn PDF document text
    • http://vegoletox.medianewsonline.com/cisco_ccna_routing_and_switching_official_cert_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fe21c4b893f6.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/tigoreg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_60281439b3856.pdfIn PDF document text
    • http://tozemudezajif.mygamesonline.org/cuento_de_la_bella_durmiente_de_los_hermanos_grimm.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/c_al_programming.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
    • http://zedebegeku.myartsonline.com/jewinevevirokokamow.pdfIn PDF document text
    • http://rosevasejila.myartsonline.com/mackie_control_universal_firmware.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/vaselere.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/86423102106.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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 5548 bytes
SHA-256: 3f86a231cc4b8872a734ee73d88bc9ec3a4f989c4382841745c5f38dae893aa1
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10564 bytes
SHA-256: 93c2bada00418b2d1be9dac3e97801f1c9e434a0f3da47f5b1932c4485a04b38
font_02_sfnt_off00011148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34