Malicious PDF — malware analysis report

Static analysis result for SHA-256 186efa87a4ee71a4…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 11:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bc5b7bad1dfe7f69b066cc7a55b2e6f SHA-1: 59397b7f7f09b6b448607b1184783b444c729398 SHA-256: 186efa87a4ee71a4e317925bcb478f73a353b78a68e45c9a199341d6174b0317
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external websites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=ashley+tisdale+high+school+musical+age PDF link annotation
    • http://geobigoni.it/userfiles/files/nafopulogov.pdfIn PDF document text
    • http://vswet.ru/f/19679262273.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/fugaxanilazudebijutujata.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/31255410514.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/zorolamitekigatidofimubag.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/ponolotinuz.pdfIn PDF document text
    • http://santeh.md/img/files/fuzakivulafetetavopox.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/kozosupulabokososujiwu.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631720980.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20211021550463627.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/pizozazuwuzonilekibiw.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/rovenubiravokuji.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210922_EA99F6B9854C5E43.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/db2bb5c1528bb291955308927f5c6c12/taximumodizufakidewepi.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/79957493306.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/jonexuzokeronuludux.pdfIn PDF document text
    • http://skupka23.ru/upload/m/98948173033.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/51583102431.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7b5d6c167---xibexixitotawodi.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/96726817970.pdfIn PDF document text
    • https://apra.pl/files/file/3256643655.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/zazimujidapedeteded.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_off0000acc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC0 10808 bytes
SHA-256: c6178486c01cc778579986e28eb257988cb02a869ee120a90d731663893b981f
font_01_sfnt_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 15780 bytes
SHA-256: a39049ee14a60b1af1ebda048414fc2022bb49b57e1f0531578668d7ded3cfd6

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