Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8bea117c695c89…

MALICIOUS

PDF

75.4 KB Created: 2021-02-15 18:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e9dc2d155cb698f7f6449b2d4c15718 SHA-1: 3c5d390ec629f48e53d79609bc85cb157b5b20da SHA-256: bc8bea117c695c89719a48c248716da27a057e9f29a89f12020aa04b91d21702
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded URLs, with one prominent URL pointing to 'jacksth.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to direct users to potentially harmful sites. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

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 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://jacksth.ru/wb?keyword=tablas%20matematicas%20de%20arquimides%20caballero%20wikipedia PDF link annotation
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/2473410.pdfIn PDF document text
    • http://pay-order.info/34704868113d821k.pdfIn PDF document text
    • https://zibiwatogotoz.weebly.com/uploads/1/3/1/1/131163514/7542641.pdfIn PDF document text
    • https://gibekadizekuni.weebly.com/uploads/1/3/1/4/131452913/9407232.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/voxipanovigepiv/belajar_microsoft_excel_untuk_pemula.pdfIn PDF document text
    • http://novabimakokoj.rf.gd/battlefield_1_companion_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/apple_tv_netflix_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/genuzewebi.pdfIn PDF document text
    • http://tujuluj.epizy.com/15874739736.pdfIn PDF document text
    • http://rafesule.rf.gd/duzinefidukodolow.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/pajonabur.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/elevator_industry_aptitude_test_prep_study_guide.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_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 5592 bytes
SHA-256: 9a60baf2ed0775670db233634b7a8c87df812b6fb05de72ed4ba04158ea0ad91
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 13300 bytes
SHA-256: af2680562c68a65ce09e1ef64d4ff107de2129cb34a5434537074929b0a39ae4

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