Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02481d78c723d6c…

MALICIOUS

PDF

153.5 KB Created: 2021-09-09 17:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 605e03b2a341e2d3083f95a36b7ff524 SHA-1: fa8eb908f592d4ef125388fad6ecb809c562a9c4 SHA-256: a02481d78c723d6ce89f656839d947cb1f9a84bcf5b210a9f2ada565c64a6a13
166 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension, a common social-engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may leverage JavaScript for malicious actions, potentially leading to the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0o88n9sca9jt6c96175b330n99/24326190178.pdf
    • http://eia-edu.com/userfiles/file/vikekufudejafu.pdf
    • https://cli-kh.com/uploads/files/202109021342125631.pdf
    • http://dalboncostruzioni.it/userfiles/files/fedufumawokuf.pdf
    • http://kientrucsangtrong.com/plus/files/67029901799.pdf
    • https://adepotcustom.com/UploadFiles/file/20210904021912161.pdf
    • http://pzhjintai.com/upload/files/sododosufudawelokujefe.pdf
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/jibesadetikipox.pdf
    • http://wx-bm.cn/upload/ckimg/files/202109031610187310.pdf
    • https://biorenta.lt/ckfinder/userfiles/files/91228839671.pdf
    • https://ccskin.com/geektic/files/lesalerimati.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5c674cc9---gijuwiletulalupokekutuf.pdf
    • http://chunmianxian.com/upfolder/e/files/20210903042909.pdf
    • http://zhuoer.ltd/userfiles/file/10787384964.pdf
    • http://jmk.kr/ckfinder/userfiles/files/sogirokowu.pdf
    • http://aarogyamedico.com/userfiles/file/keforemefit.pdf
    • http://fine-cottage.ru/userfiles/files/limowaruwanoku.pdf
    • https://bwhe.in/ckfinder/userfiles/files/61464582842.pdf
    • https://callmarkinvestments.com/callmark/files/bimur.pdf
    • http://holidayinntorino.com/userfiles/files/panaxuvikamowalewebuso.pdf
    • https://pastravariaizvoarelebratiei.ro/images/file/65197501616.pdf
    • http://2222.netsociality.com/upload/files/dagogiminejapolaxasemad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+apk+aquatic+update
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eebd.bin
5f527b3f8cd7d5ddb14acfe521921c9f03187da90c32c8e0e52ed2f75bd29cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEBD 21696 bytes
font_01_sfnt_off00022806.bin
b120b68bc7f91445e687415882e459221a4a27dbf0431527212200bd7733e064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22806 10612 bytes
font_02_sfnt_off0002402f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2402F 16792 bytes

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