Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a178d755cd5d2f…

MALICIOUS

PDF

85.0 KB Created: 2021-03-01 11:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 56ae2090537817bb447069e330ea3190 SHA-1: 90e0216271791605b44f057c8fe9e7100b1ea791 SHA-256: 43a178d755cd5d2f8238cea15eec86196ae05eb52adb58ff65894fba05958c61
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wix?keyword=nefarian+class+call+addon PDF link annotation
    • https://tivufele.weebly.com/uploads/1/3/4/6/134615601/4253180.pdfIn PDF document text
    • http://kezujogorep.22web.org/bumureleruzasila.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_5fc73adc266d3.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/fatibiruzota_sozasege_fapavesubalo_jazuxudinij.pdfIn PDF document text
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/sumolofisuguraj-vowokojokusose.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/833f400a512.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/8959075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5feec1d1581ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fcc75a59fd5b.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/diwefesez.pdfIn PDF document text
    • https://rebodegumirimak.weebly.com/uploads/1/3/0/7/130775130/876bdfbcb.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/1456975.pdfIn PDF document text
    • http://lakituman.iblogger.org/bolukew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fapizof.rf.gd/dilamonugikoburukox.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/rinisivegaxerokuvefob.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/rogue_definicion_informatica.pdfIn PDF document text
    • http://xutirekivob.rf.gd/bugotijulagi.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/46511740654.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/91892867254.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/emily_dickinson_poems_published_in_her_lifetime.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_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 4984 bytes
SHA-256: fc70b829a63b817f8d9c6811248a280e420f1479cba9694bc616e1692d4799ee
font_01_sfnt_off000122b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 10440 bytes
SHA-256: 2e27e700d9907da1b6873e9b7268e67065e2f0acf048d7c75ae8b400b1a507e3

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