Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad477eb8b0882bc1…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 10:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7a44a0cc096ed08872348b34d592fcf SHA-1: f20e3d3f3c37b606d50b3c89d51a2c6b079c08d9 SHA-256: ad477eb8b0882bc1c430810e38a0ececa8019371f8a9f597e764d9c9af2c7af9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=modern+etiquette+book+pdf PDF link annotation
    • http://puebloexec.com/userfiles/file/papumiketoxoxerawiwesofo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0ce5b5fd5---66365378125.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/sigomizitatefiloxedife.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210907014426.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/90942766853.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/nilofexufi.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/71057529082.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/zefufivilo.pdfIn PDF document text
    • http://orem.mn/uploads/files/37111005691.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vivivumavi.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/gibegubiwit.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/wefoziwivulosubogogaw.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/wesolewo.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/jujofatawasevijis.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/18375075244.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8fae0fa60---10650661663.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908060605800464.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/33235054839.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_off0000befa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFA 16972 bytes
SHA-256: 0c89538400beb0b137fc6be3971527f52eb7fae60c1054547c6b27adc9889782
font_01_sfnt_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 10588 bytes
SHA-256: 08cb731f0a9aa867349eb31b82f01cac68a9933e9c6a7985b3f17e71ea389542
font_02_sfnt_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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