Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4713f6354c6f0c4…

MALICIOUS

PDF

80.2 KB Created: 2021-03-22 08:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b36a0313cf59d74664d723a369d5d142 SHA-1: d29c39f329423b595f23f8494c6304084f78c57b SHA-256: e4713f6354c6f0c43ee4687adf97359dc6de3f8dfb13c3228c5fc1a78619ba8b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The primary malicious URL identified is 'https://leonvi.ru/strik?utm_term=dr+zhivago+cast+tv+series', which is likely used to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malicious redirection attempt.

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://leonvi.ru/strik?utm_term=dr+zhivago+cast+tv+series PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495838/normal_5fd835810244e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_600e60e69d293.pdfIn PDF document text
    • http://vawabipoxe.sportsontheweb.net/68887000862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490265/normal_5fe045ad21917.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fazujo/42034550943.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/sony_hdr_as200v.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/alkaline_phosphatase_lab_report.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_4f13a0103924462eaf079ee272639de5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedesowul/fategemunir.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/fefudedidasiter.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/year_3_digital_time_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b238dac1-e12f-46e4-b840-f0e062eaa194/rajan.pdfIn PDF document text
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_40848c0530d94b168449252c9d45009e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e8d548-9ff8-44f2-ac49-1df21b2e60b1/xejejugufiguvepopesojeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4ec45f-ff13-453d-963c-32a595bfd50a/vumerafakoraf.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/tumogo.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/wodubanofatefolexegemukam.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/vavogesasazufokutarutu.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/dubbed_anime_reddit.pdfIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_cd8e79f7deef41b083de0bdec786f4ac.pdf?index=trueIn PDF document text
    • http://zodiripek.myartsonline.com/merowukumixuwamomuvenoje.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_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 5140 bytes
SHA-256: 3514506f0453f7ebcd4abe524107431c66c6e8cd50e5e3c8f2a3995a05d6777e
font_01_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 10980 bytes
SHA-256: 8fb74d7c6bb8606a357bd5b890f4df0b3e1cceab15874c53d301f795a3f8c233

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