Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8a90b630e6446a…

MALICIOUS

PDF

76.6 KB Created: 2021-04-05 12:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 26c937a134a05b95d2d46fe6b723274c SHA-1: a3e9131e1c691cfafb273ce264e07cc1d7019d15 SHA-256: 4c8a90b630e6446aa26ebca3e43f89a89da567d76d98d3c1a4df1646629ca20e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. The document's content, though obfuscated, appears to be a lure for the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://midufefew.ru/wix?keyword=novel+road+map+to+success+fahrenheit+451+answers+part+2 PDF link annotation
    • https://cdn.sqhk.co/mifijizudi/IyherkP/kawusananuporugabisevogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_601e7a5986314.pdfIn PDF document text
    • https://cdn.sqhk.co/rufomezin/ahhYsOA/nuvafetafabinugavopibarod.pdfIn PDF document text
    • http://linefesejewug.sportsontheweb.net/calendar_worksheets_for_grade_2.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/jfjiBai/88914808218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_5fd72a2340e79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_60449c38c2c23.pdfIn PDF document text
    • http://gibipimaxadebip.iblogger.org/window_decal_installation_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/bajilevone/chaILib/hip_hop_music_videos_2020.pdfIn PDF document text
    • http://pararapameso.getenjoyment.net/biology_notes_for_class_11_chapter_4.pdfIn PDF document text
    • http://nikositukiwufez.iblogger.org/hitachi_10_inch_compound_miter_saw.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/jggX4hd/15411942979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505839/normal_60513cc7c92e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6049c38742b75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gafedupeba/xatakidosuluvovamaxe.pdfIn PDF document text
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_3b0a473449994bb097ebe5571b296820.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_423c876ecea44889960df6b71fb4e080.pdf?index=trueIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/firufofebiz.pdfIn PDF document text
    • https://90138cf2-752b-46b9-a396-1872e0473e42.filesusr.com/ugd/02203e_686a7461fa3d44b898e8ca51a743c0e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/67087816036.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_7ab8b934468c4df1bdeba3ca8b674da8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/welanisowari/dobez.pdfIn PDF document text
    • http://golunelew.epizy.com/cardiac_rehabilitation_exercises.pdfIn PDF document text
    • http://ziladujaxizi.rf.gd/jevetokenekamivi.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_83925878180e491cb5827bf10653b88a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 5792 bytes
SHA-256: 8ce60746997b29e28708430e59d51a2c98107a589b4cc0e1f0addd40e664a17a
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 9856 bytes
SHA-256: defcc14c88b21eee38532dcdf43a48d3bdea4b3dc33510a9eadbc0d9524a7cd0
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3