Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bca8d43b388f82…

MALICIOUS

PDF

79.0 KB Created: 2021-02-23 16:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a40b318c6d1ed4bd7aedec20bab75706 SHA-1: 3c22b40855afc5f018d0a1e0da144e0a45e946ad SHA-256: 78bca8d43b388f82bf78706cfecc7d2042325b2970bc22dc4024dedf3381ee92
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL appearing to be a search result lure. The PDF structure and embedded content suggest it is designed to redirect users to potentially harmful websites.

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://jacksth.ru/wix?keyword=what+are+the+raw+materials+of+photosynthesis+and+cellular+respiration PDF link annotation
    • http://excellent-spb.ru/storz_medical_cataloghqf2x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390366/normal_60014d047352f.pdfIn PDF document text
    • http://lbaranaydin.com/inner_child_healing_guided_meditationjor3c.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/hbMIIrq/vasewonurigalegutar.pdfIn PDF document text
    • http://gogotmif.space/django_template_language_if01fk7.pdfIn PDF document text
    • http://ctuxuu.com/joliloxa6mu.pdfIn PDF document text
    • http://national-verifyteam.com/falsettoland_piano_sheet_musicoa267.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/iibOfJS/cafe_racer_parts_and_accessories.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383572/normal_5fde3d7009c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fd225df76562.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420239/normal_5fce8367a00f3.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/iiEXqhh/wolo_long_horns_review.pdfIn PDF document text
    • http://stixlife.info/19195502944381dc.pdfIn PDF document text
    • http://potenciy.xyz/el_milagro_mexicano_mapa_conceptualfie3u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gapevizatijaba.epizy.com/19058996484.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/kutan.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/86315810753.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/smoke_brush_photoshop_cs5_free.pdfIn PDF document text
    • http://zajemoj.epizy.com/accel_world_light_novel_english.pdfIn PDF document text
    • http://fevepapowiwed.epizy.com/veferonixaxiwuretupixure.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/missouri_legislative_branch_worksheet_answers.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_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 5604 bytes
SHA-256: 759219b5a6c53027c49ff8c6f9115c03ed3c8cd4d4dc410dc52379231fb2ddab
font_01_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 10272 bytes
SHA-256: ee56660cce28190c37c07ea7ee613f1eb0bae0cce13bb6e1ac0c5f3cdfaa8556

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