Malicious PDF — malware analysis report

Static analysis result for SHA-256 a477069e189c9b75…

MALICIOUS

PDF

75.3 KB Created: 2021-02-14 01:25:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b2202a2f2f69033cea74be1c96657ef4 SHA-1: eba0b371110db75713e7dc37934dec2a6de0d773 SHA-256: a477069e189c9b75e7810a13075d0ee72c7f64621980ee1d0a8475e2e8905068
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL 'https://maypoin.ru/wix?keyword=topologias+de+red' is likely the primary lure, directing users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=topologias+de+red PDF link annotation
    • http://vudujupuboneg.22web.org/40619315887.pdfIn PDF document text
    • http://linogozajasupe.22web.org/quadrilateral_area_and_perimeter_worksheet.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/gapawosat_dafararaxalod_xakenepo.pdfIn PDF document text
    • https://cdn.sqhk.co/nurofiwele/ibHlVii/carriage_house_restaurant_emmitsburg_md.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/lvje6SY/stick_cricket_super_league_hack_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/6ibhbPQ/stop_them_all_apk.pdfIn PDF document text
    • http://xigirirata.22web.org/99649045740.pdfIn PDF document text
    • https://cdn.sqhk.co/fegozanodedu/NnhVYie/kelexuso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://masomivi.rf.gd/inverse_functions_worksheet_math_3.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/75932032640.pdfIn PDF document text
    • http://faloboxodutak.epizy.com/update_android_box_to_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/63643947053.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/62576942607.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/ignou_date_sheet_2019_june_exam.pdfIn PDF document text
    • http://jexusapije.epizy.com/vukexabudonusuvefu.pdfIn PDF document text
    • http://bujuxuvumelijet.epizy.com/aliexpress_coupon_guide.pdfIn PDF document text
    • http://zusobudem.epizy.com/hog_raising_feeding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/define_accole_forms.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_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 5076 bytes
SHA-256: 37c3903c617136c3cc95b96bab423ecc67080cd883c4adc8fd62b270824b7d0c
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 9748 bytes
SHA-256: d2b6386bdbe0b5d281637f4351ffd7f1860a57cddc878d87a63d7a285cbc3f79

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