Malicious PDF — malware analysis report

Static analysis result for SHA-256 638c334cdcdaca37…

MALICIOUS

PDF

67.3 KB Created: 2021-02-17 15:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 48c244206f9dccf334c734db39993c28 SHA-1: 5751772e5108ecf6c1c9948401835380a20f0f49 SHA-256: 638c334cdcdaca3755657e90c6e40cc4e70f1a16ce2f6633cdea6a70f20e7cc9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/aws?utm_term=pt+cruiser+manual+transmission+for+sale PDF link annotation
    • http://tebefomi.22web.org/85631531942.pdfIn PDF document text
    • https://morogixifidogaj.weebly.com/uploads/1/3/4/4/134497599/mojemekigozavikiganu.pdfIn PDF document text
    • http://fobutolojad.iblogger.org/vosedebarepewutezus.pdfIn PDF document text
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/1095932.pdfIn PDF document text
    • http://waxevamebe.22web.org/bozicne_slike_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463532/normal_5feb78b07956f.pdfIn PDF document text
    • http://lusejifunod.22web.org/world_history_textbook_questions_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444885/normal_5feffbb6d14e1.pdfIn PDF document text
    • http://rorezorejadij.iblogger.org/76414107391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vepisesilutez.epizy.com/prior_authorization_united_healthcare_form.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/gewotod.pdfIn PDF document text
    • http://jilovin.epizy.com/wozedowinu.pdfIn PDF document text
    • http://fulawumobolofog.epizy.com/32680079255.pdfIn PDF document text
    • http://fotizerenodafik.epizy.com/ap_ib_chemistry_ink_chromatography_lab_answers.pdfIn PDF document text
    • http://modurogodolu.epizy.com/mifafere.pdfIn PDF document text
    • http://jojemoditupu.rf.gd/gesafumatus.pdfIn PDF document text
    • http://jufomotapi.epizy.com/sobomijuwewarumejerinod.pdfIn PDF document text
    • http://sodarag.epizy.com/61048753165.pdfIn PDF document text
    • http://sulumasofip.epizy.com/59564453262.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_off0000c1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D7 5028 bytes
SHA-256: cc7ea9b32fb55759c73dd0ef6f5a803d41093bab0e92dca745bbbfab2548cbb3
font_01_sfnt_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 14020 bytes
SHA-256: 0e79678f5a20bd9eabe93e1db56e6a867c696625d9411a49b88e72dae43f666a

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