Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aac133e25a760b5…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 01:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df614634892cb0c5dfa3007173af8865 SHA-1: 07f2a33bf4ed8aab4459fa80a0797ab5015df269 SHA-256: 2aac133e25a760b5470446b079677c60dc0bcbabb18b1d6aac4917508d047129
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a redirector for a video downloader. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=insta+video+downloader+pro+apk PDF link annotation
    • http://allaboutdowney.com/userimages/10686029278.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/fusarenagubo.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/sivomireweximovasore.pdfIn PDF document text
    • http://warehousetraining.ie/images/93158616274.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/tubevu.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210917070644.pdfIn PDF document text
    • https://pepsima.biz/files/file/bumigi.pdfIn PDF document text
    • http://trieuduong.com/images/Download/vuzazidafekepe.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/72839985618.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/vubuwisuzomi.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/jitodikilisokedadu.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/menazuk.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/nagajunebabe.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/wazunut.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/gedaduzedomirexopepurefil.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091023004773499.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/41100839208.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/66758740332.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/wekogatevovibugobonewap.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/46503209328.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161361be417d0a---wubizatojodewif.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/zurulibowanoraxasi.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_off0000d36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 18644 bytes
SHA-256: 455158d55549aff1d4bc7c1b70e4eb7d46b78b37d58de2a8e05027670564a5dc
font_02_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 10580 bytes
SHA-256: 1e30463ec4089050e8883cf510334923533d3684f4c91b3401d0fdf2950a84d6

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