Malicious PDF — malware analysis report

Static analysis result for SHA-256 df34d55c07c6fe5b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 21:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 603383b2f6b78961abca53a9f1472888 SHA-1: 29038213e6fb7d8bcbba1c7073b214fd8ed736e3 SHA-256: df34d55c07c6fe5b3cbede9ba01fa40206f0d09c3c76f9f861e650c4641a7018
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The presence of a 'download button' heuristic further suggests a lure to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://learningkey.org/userfiles/30393481354.pdf In PDF document text
    • http://fc-junajted.com/upload/datoteke/nofit.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/98173422985.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/zuvejep.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/12153022803.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/siluwo.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/96445178599.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/bopotodelejitavadidizum.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dd624da4---pifinanomasanidevafag.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/wowefufugelewefujikeruber.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613739e80d153---kuzumefowuwujogunakiniwus.pdfIn PDF document text
    • http://hkalc.com/userfiles/37259019932.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/furigawotujevuvo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/64501141218.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/renamasotetuxamibepujurux.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/88186238898.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/25907759087.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/bh5j0v3b0t8r97js7gu3ibbl16/61796313048.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210911_175736.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/kuwuk.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/wimivedefav.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/9203111493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=top+launcher+apkPDF 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_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 17568 bytes
SHA-256: 6f8df7b761d6971aabf5e5602878dddff5aee6d931f2c7060904917139f61f5f
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 10268 bytes
SHA-256: 637001a48b5569399468433f01812d547633efc8b3d8e80eb28930acf014c18f
font_02_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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