Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ed21d659a1ad60…

MALICIOUS

PDF

76.4 KB Created: 2020-11-23 22:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2f5aa8dbe741ec99ab086e25bd844911 SHA-1: d9e8d0fbc2649916dd1bcea3a18965d2de91b5a7 SHA-256: 81ed21d659a1ad602c3b50f8a884eaaa8b3cb21fb2cccf98cfe2efc4539da64c
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/strik?utm_term=the+incredible+hulk+1080p+hindi+down PDF link annotation
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/dakogukozu.pdfIn PDF document text
    • https://liwujozixo.weebly.com/uploads/1/3/4/4/134497145/pitezegezodisitogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_5fb99e2985d17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_5fa5867b1f003.pdfIn PDF document text
    • https://jabanomazekapuf.weebly.com/uploads/1/3/4/7/134743752/4eda9.pdfIn PDF document text
    • https://pusinoki.weebly.com/uploads/1/3/4/6/134628586/jogasug-likili-vowunanutinati-jegunaguravegem.pdfIn PDF document text
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/xijaxumir-benifoku.pdfIn PDF document text
    • https://giroxutega.weebly.com/uploads/1/3/4/4/134438368/givunorenemegir.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/9eb33321e3789.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/zuzodazituguzus.pdfIn PDF document text
    • https://vowimusu.weebly.com/uploads/1/3/4/6/134655535/81ed12e407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 5408 bytes
SHA-256: 953dd81d319fed7612c73b59565086f565208628ca764a0f0ce6e1f4f435e75d
font_01_sfnt_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 2664 bytes
SHA-256: 5ba18b4eb1c88c2e1316a13d9d726991fa8523afa82444755d60a8b4997a4f79
font_02_sfnt_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 11048 bytes
SHA-256: c665bc8512a211b475eb0092d64e91310a35ce728306595c05131181f77f5c8d
font_03_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 16168 bytes
SHA-256: dcc437beaabc532c244cb2402c7e187dabb6fccd34af89cd9e2270a2a4498d3d

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