Malicious PDF — malware analysis report

Static analysis result for SHA-256 f802def70d55d23d…

MALICIOUS

PDF

71.2 KB Created: 2021-02-18 09:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 45e482be38a045727f99dad09fa71ba8 SHA-1: 22fa5f79c84783fae0eb4cd6c60032d82171d790 SHA-256: f802def70d55d23d38842ad7424898d9b579c17e1d25e7b1ef98ec78518fa01e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is structured as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of 'utm_term' parameters in URLs indicates a phishing or spam campaign, likely using search engine optimization lures.

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://maypoin.ru/123?utm_term=sex+offender+registry+elkhart+county PDF link annotation
    • https://cdn.sqhk.co/muzedikerum/khcAidK/dubofozonojominitipekex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376101/normal_5fdf2f6a7f8f3.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/c9b3cbc9f046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5fe45417a69ef.pdfIn PDF document text
    • http://bezigex.iblogger.org/bejurajujunevejuboraxek.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/muwenav.pdfIn PDF document text
    • https://rojanebe.weebly.com/uploads/1/3/1/6/131637229/tisuporituzede.pdfIn PDF document text
    • http://miwopejodap.iblogger.org/xoxig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413842/normal_5ff1c4f321258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fd67c4563583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446781/normal_5ffec26785bf1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dazimosanugep.epizy.com/emergent_literacy_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/the_binding_of_isaac_rebirth_descargar_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/fawelet.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/daselusewiwepo.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/42509602688.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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 5620 bytes
SHA-256: cb42f161d7e696c3bd3f67deaa2643055c40745eb5e706688f393b25e2b5e84b
font_01_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 10420 bytes
SHA-256: bb8ae42f0897ee01409f5150442a461e2f5289870f5e3d5b9e428cd6d1ccd0ba

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