Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3c3202921cbbcd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 06:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: caef5479bbc5b96d285197b2758fc444 SHA-1: a597986ec93f27bd6c57c06a5fad8f45f4bdcdac SHA-256: 1c3c3202921cbbcdacbb5a5ad59ec0248b92eb8e110b431b314d144d3625b513
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that redirect to other PDF files hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=smith+organic+chemistry+solutions+manual+pdf PDF link annotation
    • https://studiecarriere.it/uploads/file/ludemifegat.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/zalejipidi.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/rajimuwerupenirozirol.pdfIn PDF document text
    • http://fivelscope.net/fckimages/42258953223.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/97188490395.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/53522773949.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/zesijavupameza.pdfIn PDF document text
    • https://kede.org/userfiles/file/78888436052.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/tovelilisobobav.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/72275065088.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/dubaveno.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/zodelas.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dbbc81f6---23142503781.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/zetatolesugorojukikizixe.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/rixawuzovire.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/45334540113.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/51124514081.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/32047089945.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/9360679087.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/42954415565.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/bupesurarub.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/jamafe.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/lipotusek.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/jofomijowejixo.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/xepidasowup.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_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 11356 bytes
SHA-256: efc8723d120e523980855435b2601407e41445eda27120055909607dc8af46aa
font_02_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 17640 bytes
SHA-256: 9ce2928ba9f7b274215ef852fa076cd3bb0a10ebeead23b7a1f1c75b04d43476

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