Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cdd68d061bd103…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 08:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 753867a00d8f91f02bd1ef57f97a3c6a SHA-1: d8bf6e222e9f6ea0f201478e9a423cf927867975 SHA-256: a8cdd68d061bd10383dcd749adb537acef06c0bbbd08327b14242334ee1ebdde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The PDF structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.channeloflove.com/ckfinder/userfiles/files/vojuxotefulogabinov.pdf In PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/vevoninug.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/kulusev.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210904144843.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/66818816489.pdfIn PDF document text
    • http://jecoexports.com/ckfinder/userfiles/files/20883804762.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3144b8d4---46522667732.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/64943025910.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tifevojuluruga.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/80858818038.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/83010261416.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/45720749099.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/rogekizonok.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/56340871013.pdfIn PDF document text
    • https://andana.us/files/files/mesenulonujeso.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8fec8d80c3a4f1d290c5af900e28b169/pukusebovivijedidixokep.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/25283446302.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/xujifasuvufokijebes.pdfIn PDF document text
    • http://precisao.org/files/files/surejoxatoxarodusi.pdfIn PDF document text
    • http://vhktn.at/images/content/files/27575354886.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/kewafisofojogukasaz.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/wadematedaxupagalut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vsco+mod+apk+latest+versionPDF 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_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 18788 bytes
SHA-256: 883ac6d4036bf7a82c3f0ca285b3605676350b2b612e3a3e412e009e3a97a1c8
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 10804 bytes
SHA-256: 2d6e7c6c766b6c43ba650d5bd29657ba58422ad2959510b55764ad3095881350

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