Malicious PDF — malware analysis report

Static analysis result for SHA-256 239fef41ec3411a3…

MALICIOUS

PDF

74.2 KB Created: 2021-06-01 02:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0c8155c21d8c9b8ef381132c0734b823 SHA-1: 434210d155357f05a434e35a2e2cc62694f76dc6 SHA-256: 239fef41ec3411a36f9873b0488bdbebeb5250ba368a1c319c7818b3351d5217
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of a URL with a "watch coraline online" term indicates a lure to entice users to click. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a dropper or redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://medvor.ru/pbw?utm_term=watch+coraline+online+1080p PDF link annotation
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/1014585.pdfIn PDF document text
    • https://lozagazol.weebly.com/uploads/1/3/4/2/134266804/1397735.pdfIn PDF document text
    • https://tenaxegib.weebly.com/uploads/1/3/4/5/134583113/43177422.pdfIn PDF document text
    • https://pafuzoxim.weebly.com/uploads/1/3/4/5/134585506/3480190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455176/normal_605888080ebb7.pdfIn PDF document text
    • https://tumirovuwepilu.weebly.com/uploads/1/3/4/6/134603677/durarifofinili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_600a4c1eda0a3.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/0160ee11aed85a5.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/1442063.pdfIn PDF document text
    • https://keridamanitev.weebly.com/uploads/1/3/5/3/135326745/ritut-jegoxasoviwep.pdfIn PDF document text
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/4301200.pdfIn PDF document text
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/zigidefitiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_604a4a8186f9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_605114cb7cc8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416332/normal_602be49ea0b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_6027ccf80d0ed.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/5917907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_60645c9e80a4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5fed1b3120399.pdfIn PDF document text
    • https://woxavadegiw.weebly.com/uploads/1/3/4/9/134902916/0000e8e836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5ff4a94ab25df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46ee304-fffe-4f63-9d93-b49aa23d7bae/nimerirefopujofezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d8148ab-76af-4729-a41b-113f4ee9b148/mowumexewilukimikokuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ff9595-f6b3-4998-89d7-8e9ac5c7717f/57782450180.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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 5244 bytes
SHA-256: d3c6ad34c7892152641516a887b37e7fda98bedee278765bdf5707f70a38be63
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 10952 bytes
SHA-256: 78812b3f29153d8642233ead730943c55e0bef215355e7183ba939032a11e0cf