Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbda10964c51d517…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 15:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 576f553b8ec679fa06dfd504958c8327 SHA-1: c6cafe1b94070956337aef12a272cd1f246ad35a SHA-256: dbda10964c51d51754c1d43268e0d939b31a8299057f1eb72eee0c6d3df8e7ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains that appear to be used for hosting malicious files, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the structure and heuristics point towards a common PDF-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://himalayanespresso.com/espresso_ckfinder/userfiles/files/fosedudodalenukazur.pdf In PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/90758769445.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/bisilerupu.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/95976403170.pdfIn PDF document text
    • http://poliinc.com/upload/files/17402117021.pdfIn PDF document text
    • https://atiksigorta.com/files/2199888869.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/jurufenujibepukopedafe.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/23816455475.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/zabisukaxukapuzuwag.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/63731246521.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/49308406608.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/36206806736.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/57909058.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/dofiriwodijezalad.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109102312022951.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/xobetebatolize.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/58784059758.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109051947257917.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613937ccc2f7f---lemozovimatoradevoxog.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/jidesilorizufewuxibo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146be81e77c1---19708156273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+frozen+2+online+123moviesPDF link annotation
    • 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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 11064 bytes
SHA-256: 72e65fe0c48e95324a9d4056023e429efcf083a6401cdf6ca6239ab65ced38a6
font_02_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 18692 bytes
SHA-256: c8793e8c43afe872cda3443b055d50f7abdbc9a18494e542f113857adf5a5198

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