Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b10a6d8ddab258…

MALICIOUS

PDF

76.3 KB Created: 2021-03-03 23:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7b062aa470279a590e44292f342e29be SHA-1: cc67137c91f58d8f8dd2a2f380ad425ebbb541dd SHA-256: c4b10a6d8ddab25815e911275a77dbd74fb08cf95ad92e562d2f5155d47a8ff5
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm or phishing lure. The presence of a search query in the document body, 'Nail salons near me open on sunday', is likely a deceptive tactic to engage the user.

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://lozipotod.ru/strik?utm_term=nail+salons+near+me+open+on+sunday PDF link annotation
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/xolinazosanezusuw.pdfIn PDF document text
    • http://famexukox.22web.org/46950277005.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/what_does_patriotism_meaning.pdfIn PDF document text
    • http://sofuwabafa.iblogger.org/fagasisomukog.pdfIn PDF document text
    • http://baykamif.space/6139915664ii2it.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/7873840393.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/34044517757.pdfIn PDF document text
    • http://uchebnoe.website/epsxe_gameshark_codesdsvol.pdfIn PDF document text
    • http://wikuseweluwi.iblogger.org/pejuluz.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/jijari/tijadelowobubalemoja.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/99428399521.pdfIn PDF document text
    • http://xifogufog.epizy.com/sustainability_report_disclosure_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/76601968685.pdfIn PDF document text
    • http://pezamax.myartsonline.com/56114491275.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_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 4980 bytes
SHA-256: 68906b09989fa9d6d1a26de6bec6a597099acdce5f76cd4ce23f950cef554418
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 11272 bytes
SHA-256: ff1ea008e0562c4813d301fa706f66023ff2a7b337d6a4c51c877ba89c2aa483
font_02_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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