Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff48b4fdd1eb7d9d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-24 10:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7c5bf28b355cf918e4b29ddecbce17a SHA-1: 3909dad9bfc0236d32be106fe87adc316a245b72 SHA-256: ff48b4fdd1eb7d9d9b2573e4acc539203ff1b071cd264981aec59ccee4e43a47
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including one pointing to a link farm, suggests the PDF is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=samurai+shodown+5+neo+geo+rom PDF link annotation
    • http://classicalgardenfountains.com/uplds/file/90634180814.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/23793481082.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/zufuwuxaxopexanajukeruv.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/95079993084.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/situsun.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/lujijopujinajopu.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109191813331431.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/68539808823.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/80738669184.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/nogezibufifomox.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/mowiw.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/68431126743.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/turukowifuresorunove.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/74139999400.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/36959320559.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/83404083696.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210901_2031679011B89E25.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/bowiwolosora.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/42380919849.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/nedajesagigako.pdfIn PDF document text
    • https://webmenuplus.com/images/file/43131146310.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/53097153286.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144bfc557c98---34828794798.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_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 19044 bytes
SHA-256: bb1fafb7b0d4576b9ac670f0ea51f846ae10773b911130f78c01c260c1352956
font_01_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 10944 bytes
SHA-256: 9e60bf6b5eb1875eaf00d1fb874620d857f8cf3f4ec9a48b192b1f8f3d36c697

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