Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2d81e3197f08b2…

MALICIOUS

PDF

75.5 KB Created: 2021-05-19 03:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: da0ed5a741bdaf3f4979c925171df5e2 SHA-1: 55feed489a5ae01f747589f0cea6a9cebe8b6816 SHA-256: ba2d81e3197f08b2bedfcfc10efc0927ae3dc7fe41c5e9c613618b2eef4cb760
186 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 0.9998

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://maypoin.ru/strik?utm_term=how+can+i+download+free+songs+on+my+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486748/normal_6017bb76a6f8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_601731d556b15.pdfIn PDF document text
    • https://fomikozifu.weebly.com/uploads/1/3/4/5/134511133/pomesuk-mibuleporoje-metonubuvojabe.pdfIn PDF document text
    • https://dagaroxir.weebly.com/uploads/1/3/5/9/135973008/6215243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_602809b03e65d.pdfIn PDF document text
    • http://lanafobigowo.22web.org/sibamalegitalis.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/tisofezik.pdfIn PDF document text
    • https://gejosabuvin.weebly.com/uploads/1/3/4/4/134457948/1994eab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_600e3f385cad7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5ff285ffe8b4a.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/lupewibojoju-pemuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453327/normal_604e89e2b2b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_6047752bb0af7.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/dufefoxogirolatom.pdfIn PDF document text
    • https://nukijevexumi.weebly.com/uploads/1/3/4/7/134714394/jaranimojem-poxudepeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gidepajujida.rf.gd/wajobatogerusire.pdfIn PDF document text
    • http://juxugalipexobow.epizy.com/think_of_me_lyrics_phantom_of_the_opera_sierra_boggess.pdfIn PDF document text
    • http://widafasamuj.epizy.com/16440326310.pdfIn PDF document text
    • http://fobiwuna.epizy.com/netbeans_ide_php_tutorial.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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 5724 bytes
SHA-256: 89e0fed886c2e82b3f6c4e2e36943d179ba2a28c94c44ac1d5203c3d7f49c8cf
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 10632 bytes
SHA-256: f352a6dbcd6e142d4e5ec6d31a70f42567854bfde8354fe5717a39b3015d8af6

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