Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b48bf7c9fafdc74…

MALICIOUS

PDF

73.6 KB Created: 2021-03-02 05:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9c82e1511ee983d13d7966adf1d61126 SHA-1: 517cdef4dd9e3eabdde57d1178c5d17eb7f1fa06 SHA-256: 3b48bf7c9fafdc7451ae48022c5170fb122e0f11ef835f5217d43fd3c8061bed
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, many pointing to disposable domains, which are characteristic of link farms used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the primary function of the document.

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://bologen.ru/strik?utm_term=us+stock+market+closed+on+labor+day PDF link annotation
    • http://dofujifeluradep.medianewsonline.com/what_is_another_word_for_dissatisfaction.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/16164626179.pdfIn PDF document text
    • http://pukujadud.getenjoyment.net/how_to_reset_your_vizio_tv.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/monozarajuv.pdfIn PDF document text
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/1325545.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/27772172506.pdfIn PDF document text
    • https://tajadituzutop.weebly.com/uploads/1/3/1/4/131409135/5ed286.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/nabelowaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/hhdgjTQ/lymphatic_system_diseases.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/cnJDpgf/winker_reds_injury.pdfIn PDF document text
    • https://divupitibi.weebly.com/uploads/1/3/4/3/134328085/vojejawexu.pdfIn PDF document text
    • http://zakunofukar.iblogger.org/faremozalijopima.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/51509291390.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/zujelibikilisigogamolaw.pdfIn PDF document text
    • http://davinawoguzag.atwebpages.com/69192075047.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_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 5384 bytes
SHA-256: 7c3de3401df217b8a51af9df6aada5ad10beebf413b160d62dbf0927217e35a6
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 10932 bytes
SHA-256: f26d8172726e222705128a57534c87637457c29dd06f7a007dd569b2173aed32

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