Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11ee3a21b01ba68…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 00:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33a7404d95b4c808a6e8f1d6019df4fb SHA-1: 766f267aee331a46f3e996d78e27c4adc3cfba36 SHA-256: a11ee3a21b01ba684cc32e1bae978ee1940fbcb755d6bd8e78a0c086498d80d8
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. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a redirector or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample as a link farm on disposable hosting, reinforcing the phishing/malware distribution hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=adjectives+that+begin+with+a+to+describe+a+person PDF link annotation
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091412282480554.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/57242591688.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/41943132364.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/16594891439.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/farenigomewumipepitajale.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/42600875742.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109091949243653.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/pizibunakoxezototili.pdfIn PDF document text
    • https://km2804.com/ckupload/files/58124467730.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161445d975f3ed---11374546723.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/23497168952.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/78251316412.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/79390845039.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/46052520253.pdfIn PDF document text
    • http://megalaserasia.com/upload///nijititilagixigikemol.pdfIn PDF document text
    • http://askaudit.ru/price/36476481402.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/98968839741.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/57709871200.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613435af6c5a7---kijawija.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zemagurekunu.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/wuwugaxovapufize.pdfIn PDF document text
    • http://hrudolf.com/userfiles/gubaxeman.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/63233226500.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/27712811586.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/82582935929.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_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 11152 bytes
SHA-256: e80000162d3fd79ca65214b72bbc2a2e6ce3bbdf64e26766f901f409da9f483d
font_01_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 16824 bytes
SHA-256: 517af51951454fdffbddfb5525697430ab0f37975b8fe6c5ce03410c88e46eab

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