Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b50f01937a2dae0…

MALICIOUS

PDF

73.3 KB Created: 2021-01-23 11:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e3254e8b6522aec03488c1e5c85f5670 SHA-1: 7e38df987ae1b509c46d539d4fe67d831201a126 SHA-256: 2b50f01937a2dae07b29b07514f804cca6022589de2a9317d7389daff6da0d88
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF generation tools and dates, but no direct user-facing text that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=chief+information+officer+job+salary PDF link annotation
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/webarilux.pdfIn PDF document text
    • https://site-1175393.mozfiles.com/files/1175393/orao_arcanjo_miguel_21_dias.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500883/normal_5fed17dea1f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_6009b2b1cfcc0.pdfIn PDF document text
    • https://site-1203881.mozfiles.com/files/1203881/real_theft_crime_gangster_city_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402707/normal_6004779738901.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/vabuw_nimefowe_visigera.pdfIn PDF document text
    • https://xulexina.weebly.com/uploads/1/3/1/3/131398260/298857e8c12e.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/fegufofen-zetorolabebojef-vopimitas.pdfIn PDF document text
    • https://famelugosa.weebly.com/uploads/1/3/0/8/130873944/xuwufonabekiso_titoduw_lawupunig.pdfIn PDF document text
    • http://nizuloxodiza.iblogger.org/fegovudez.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/sazomo/leona_lewis_one_more_sleep_sheet_music.pdfIn PDF document text
    • http://jipowefata.epizy.com/autodesk_autocad_architecture_2014_free.pdfIn PDF document text
    • http://kegaregajisojas.rf.gd/miss_bala_2019_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/gameboy_advance_emulator_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/ay_khuku_aye_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/vuvonefibexed.pdfIn PDF document text
    • http://roxeruteruda.epizy.com/whirlpool_dishwasher_wdt730pahz_user_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_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 5344 bytes
SHA-256: c2f2ba7bf8866d4ec457d300ad7cd56346d0d8b6659792b9ae5f3e31cbbde00b
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 10444 bytes
SHA-256: d5983dfd5a93021d4f84495a870de26867a40ac2b72146fe5a385519ebc8c9f4

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