Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e71bc5637e1141…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 22:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31a5516eb16c02210fbe7953e4288f53 SHA-1: c241a73a7f614468b3e24c762807bac9c643242e SHA-256: f1e71bc5637e1141ce92d80fca3803974c9165c2cc40195355eabf064773a0df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with a heuristic specifically flagging it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=mary+queen+of+scots+full+movie+free PDF link annotation
    • https://mabuksusu2.com/contents/files/gesilegasuv.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/sabakakone.pdfIn PDF document text
    • http://goldmustang.com/files/files/fefemuv.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d570e066f---wozig.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210911025821.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/61444283574.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/22693342804.pdfIn PDF document text
    • https://zhansq.cn/upload/file/82821211933.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/gofajonajovutof.pdfIn PDF document text
    • http://julianina.dk/upload/file/matejisibe.pdfIn PDF document text
    • https://777mto.com/contents/files/81172993128.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/megoretonuvifura.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/331b59a435c69d5f4f487b1df2197a27/pusodazavinavefibubuxirap.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/70886553200.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/62436184517.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/68727275350.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/67653716674.pdfIn PDF document text
    • http://elma1.ru/!upload/files/volurikutituzaxi.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/95117719028.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/73523288812.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/tewupotejoxalivukozura.pdfIn PDF document text
    • http://opsir.eu/files/file/22073725769.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/gowuvowaz.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/giloder.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/riwutotipoxitirorive.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_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 18044 bytes
SHA-256: 473b61bda412b2c1fa96b4c105b717ae38a7db6f54f6f4d209012d906d05cc43
font_01_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 10916 bytes
SHA-256: 6232de81e79fb11a69453366b3d07f41270afa6f030511f751cb72f77798ce3c
font_02_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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