Malicious PDF — malware analysis report

Static analysis result for SHA-256 93016e582542cc24…

MALICIOUS

PDF

69.9 KB Created: 2021-09-13 07:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 809c39739746e063c70b323da6035076 SHA-1: 932624a6e21df99fa92c7c1847b12d238d2b03a7 SHA-256: 93016e582542cc24a2c21bb906a14d709bdecf6279240dda082f9b5cc8499499
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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://catamma.ru/uplcv?utm_term=die+hard+trilogy+ps1+rom PDF link annotation
    • https://anjingliar.com/contents/files/52354123464.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/75442941333.pdfIn PDF document text
    • http://runo34.ru/attachments/file/visazorovite.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/powimizekod.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/sobofavopufefaxa.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/10961665385.pdfIn PDF document text
    • http://web5gstore.com/Files/files/44540734906.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/40392851086.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210911_A711D10844C71D3B.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/46715739839.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/7347848235.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/92972693033.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3b504392---91257075531.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/51131051712.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/ravin.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/posez.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/desilarokakomobisu.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/tifafos.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/dupokolebiw.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3s10afkoquplg71f2fl3o5m9k0/78856672905.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/29057501917.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/jipigarevuxudakomej.pdfIn PDF document text
    • http://reichspfarrer.sk/file/gapuw.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB005 10904 bytes
SHA-256: e95e18ffdc4405a166f010c21f8ba05865d4ddaf4c932b5b5e1cedeac131c339
font_01_sfnt_off0000c91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91A 16116 bytes
SHA-256: ee838c10b030c8c474c781b728159b7054f875742bdb8fd4f30ee005e3ec81c0
font_02_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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