Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b7d3e569938167…

MALICIOUS

PDF

72.0 KB Created: 2021-03-29 09:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fe9e2dd4bd552d7ea26d2ba9edc1e47d SHA-1: 0e48c2548cf33efa5e13d0d4d2cde34aaa4bb4df SHA-256: d9b7d3e56993816704ab2e037ae56026fd47b5ff53f4797fe2314192d9b9a29c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/123?utm_term=bmw+road+map+europe+2019 PDF link annotation
    • http://popisazono.getenjoyment.net/probability_theory_a_comprehensive_course_achim_klenke.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/28192497931.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/aneurisma_de_aorta_abdominal_infrarrenal.pdfIn PDF document text
    • http://lenusabipowezo.getenjoyment.net/23850849743.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/92195530310.pdfIn PDF document text
    • https://cdn.sqhk.co/sexobivobufo/hhjamic/talking_parrots_for_sale_near_me_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/j6iacgd/wiaa_football_2020_covid.pdfIn PDF document text
    • http://zofugef.mypressonline.com/kilawujezizibanidusixesav.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/Zhf3YhU/57348595284.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/rMVpijc/myair_mask_leak.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/jenagubadopi/5074366262.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/moto_preo_de_tabela.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/42775114881.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/66597006396.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/16097024211.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/byron_katie_jyn_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/bhoomi_online_karnataka_rtc_form_16.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_416965327665453b82021be9bb73ba4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vunizi/yamaha_mg10_2_mixing_console.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_402a268fdfe4460296db7b6a89b5ee86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nemafu/allow_cookies_chrome_android.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_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 5520 bytes
SHA-256: d6966d6b125d8f9dd46e3f8be846989691b646844d59d46011cfe435d7e949dc
font_01_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 12444 bytes
SHA-256: dfec24225002016b43b8a6b0bf24917b85e5499710e62d3b8b28ce46f5136b92

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