Malicious PDF — malware analysis report

Static analysis result for SHA-256 162b83e06dd3bebc…

MALICIOUS

PDF

84.1 KB Created: 2021-02-12 15:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bc0311ea45d15af611cf83dc955d551d SHA-1: 470374eff5ad42cd4b51ec70a3c2a54a152f530e SHA-256: 162b83e06dd3bebca6e83c9d34cda99ff89a61e3b8acc8967747180e5d0cd5e9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=directv+madison+wi+channel+guide PDF link annotation
    • http://finansi-7.online/android_9._0_pie_iso25lcr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426549/normal_5ff767529fe98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_6019ff44c6f8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_5fd6e0484aa6b.pdfIn PDF document text
    • http://nukicew.xyz/website_template_html506vjy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_6015d36f55331.pdfIn PDF document text
    • http://sallehub.xyz/lohmann_lsl-_lite_layer_management_guidextzzr.pdfIn PDF document text
    • http://uscreditmonitoring.info/vanetodughr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455176/normal_600fb28a48b3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501770/normal_5ff81bcee9757.pdfIn PDF document text
    • http://pujuburebofig.iblogger.org/55904003145.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
    • http://vilusosexar.epizy.com/xobazinim.pdfIn PDF document text
    • http://totawuvibewe.rf.gd/shazam_apk.pdfIn PDF document text
    • http://sawutekoxa.epizy.com/12619315189.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 5388 bytes
SHA-256: 7ec8b1e7ff6c544ad1bdd6022ce7309733b19f4ff5ce5b00ff66da3f4c82674e
font_01_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 16724 bytes
SHA-256: 314f94176d2c8c15be37f814e87490ea4dff789aff087e0a4969128b221175d9
font_02_sfnt_off000135c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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