Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc852110bea1bc22…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 19:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 762b88084e8ee306761735f2901445b8 SHA-1: 4e2a880d0dd2d34eb75b2730811c404222faab9e SHA-256: cc852110bea1bc2285d084fbf8270295b740b5af81be9efa03a2b2d288b3c6ff
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and a lure for password-protected archives. The embedded URLs, while some are benign, point towards a phishing or credential harvesting attempt. The presence of PDF-specific heuristics suggests an attempt to exploit PDF viewers or deliver malicious content within the document structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://horvathortho.hu/tmp/jijenafilawekud.pdf In PDF document text
    • http://copy-office.it/userfiles/file/13832329014.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/12051599937.pdfIn PDF document text
    • http://belean.pl/userfiles/file/24592114409.pdfIn PDF document text
    • http://zkpower.net/upload/files/30587954151.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/11896529424.pdfIn PDF document text
    • http://coffee33.ru/archive/file/varuza.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/25112565005.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d38a8bfc---73891714688.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/52915944725.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392b9dc2db5---wagivawozif.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/11671411587.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/lubeleketedisena.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/gapuvowisideseka.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/11479966814.pdfIn PDF document text
    • https://loyd.rs/images/file/gubapuxerezobiduruvazu.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/papepumafedod.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/78574161173.pdfIn PDF document text
    • http://qzgj.cn/upload/file/37246444994.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/20726085666.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/pilotegijawideveguteduwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=recover+skype+password+androidPDF 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_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 10764 bytes
SHA-256: 0a86b6bf5bb9ce28cc40f8314725c4d796ef5b2cc208592dd6a9c1d22e844584
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 17348 bytes
SHA-256: f098a360dd825f70165f567ff75f4cbb6a5cd711fdead4f715ea569d09e0ed0e

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