Malicious PDF — malware analysis report

Static analysis result for SHA-256 605fcf66374b9c36…

MALICIOUS

PDF

73.8 KB Created: 2021-09-08 14:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e85902804e7d18aa6c6cfeece4d09cf3 SHA-1: 2d46b0a44dae43bbc1dfafa1c6468f229bec9a45 SHA-256: 605fcf66374b9c36a56331c756d42d4e6268cdfee93b340a052b2edfcc984bd7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript which is a common technique for executing malicious code. This script likely redirects the user to a malicious URL, as indicated by the PDF_URI heuristic and the numerous suspicious URLs extracted. The ML classifier and ClamAV detection strongly support the malicious nature of this file, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=forensic+medicine+and+toxicology+notes+pdf PDF link annotation
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/71689101412.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/gimaforepivekobaxepogam.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/sibojifakoto.pdfIn PDF document text
    • https://intersat.lv/files/file/melesemobuvinulujukirixig.pdfIn PDF document text
    • https://eguiders.com/uploads/51148786064.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/67867515195.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/32918814546.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/puzimoboxodofeje.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/34252317746.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202197138442140.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/subiratejusotudinufadufuj.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hf33fjiknroqisk3fo59qaus21/kedojamulitoterixolovob.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/4626130896.pdfIn PDF document text
    • http://cecev.com/stockages/files/40645547738.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/9331942218.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/sezata.pdfIn PDF document text
    • http://gewald.ru/content/Files/85783072551.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e4626eade7165d26d4aef7ed55f14742/lefurevelupujalexegajuk.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/11771316730.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/33894620796.pdfIn PDF document text
    • http://jn-zhsc.com/upload/walojeronixugimeno.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/57929111349.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_off0000ba4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4B 17704 bytes
SHA-256: 3922180e5ee7cf3a12d216d6ba09623a9243bb1e6f877facb39ce58a9a17999c
font_01_sfnt_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 11156 bytes
SHA-256: 4be7f8073c7455c5c332bddf5520381f505d9c9c314dafe1be2dcb0610bb31ce
font_02_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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