Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6853605d8814d70…

MALICIOUS

PDF

68.2 KB Created: 2021-09-15 14:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf16f64f3b150809c84cf84c6249ee4a SHA-1: fa3a44d23ba22b15328270fba560f9829f1abc68 SHA-256: a6853605d8814d70f848b56dc9c54a9f1300ad0959ddb6345afd4e8558537dae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many of which are on disposable hosting and utilize UTM parameters, suggesting a phishing or link-farming campaign. The presence of external URIs and the overall structure point towards the distribution of malicious content or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=long+o+words PDF link annotation
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ff91f266---tizinibafozowotunuxo.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/jevidof.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/tawivevijodatakepuvat.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/xufogebug.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/94112832988.pdfIn PDF document text
    • http://air-con.ru/upload/files/mulasutagugewotomu.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/lulazonixuji.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/lenazifefiwakurudimeze.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/016748ffaff0ac104543d3591f474ef0/36776704164.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/labakem.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/43206943736.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/mekuvif.pdfIn PDF document text
    • https://tekartltd.com/upload/files/61203947108.pdfIn PDF document text
    • https://edarky.net/data/file/zaligubera.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/14073124042.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/86883703376.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/juzutijukupesoxagi.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/55616778410.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8df63f385---51607207672.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/14712662365.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210907040826.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_off0000ade2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F4 15852 bytes
SHA-256: b75ded368af28cf54a078adb0c9f218e75d130749ae0d37eb35e09fddb1c2eb1
font_02_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 9936 bytes
SHA-256: 52bf94470bbd3654d179a7044cd058ee20b309d985b5b557fff8b47b06af7b96

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