Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b8c1a13fdb9e4e…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 15:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59a4fc31907a05502384d64a9ff973a7 SHA-1: 12d335129ebc34d326cf335e1e52327d26d11de9 SHA-256: d1b8c1a13fdb9e4e336a65d18398077225ffbe56a4c6e2f1b1d0ddc6038b1342
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document.

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 http://starfishdowney.com/uploads/files/21995681677.pdf
    • http://bakineshr.az/ckfinder/userfiles/files/kobotile.pdf
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waziwutusa.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/3beadbf3aeff5231caecf9b0c38397d9/resorataxekanawutidejez.pdf
    • http://gndpta.eu/news_objects/files/nifatozolofajif.pdf
    • http://aaz.sk/editor_uploads/files/62270184570.pdf
    • http://assytekservizi.com/userfiles/files/10665393741.pdf
    • https://gesema.com/UserFiles/file/92227310259.pdf
    • https://norservis.info/files/files/13051648185.pdf
    • http://rayer.cn/d/files/rezed.pdf
    • http://mikomisushiwc.com/uploads/files/55260005726.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021091112294873499.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/pofusanubafufinu.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/41194624829.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/64575403681.pdf
    • https://yp05.com/_UploadFile/Images/file/webegavareza.pdf
    • http://sasnowosielski.com/ckfinder/userfiles/files/febijowavis.pdf
    • https://tradingphrases.com/userfiles/files/lajafedagosijopedisaba.pdf
    • http://ebd.su/UFD/7623/files/32378441612.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210911_FEE480CAE3343399.pdf
    • http://oldadmin.k12cart.com/media/files/kivotuwojub.pdf
    • http://minhnguyenvn.com/uploads/userfiles/file/3770971596.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=to+say+that+electric+charge+is+conserved+is+to+say+that+electric+charge
    • 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_off0000b093.bin
d4e3cf4ba3b2272846e32b105bfae973ab5d5faaf30d8af8b698948ea518e514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 17000 bytes
font_01_sfnt_off0000dbb1.bin
5ce4f26b04b8240d84146a97a49e2b50f82e3cde48d648ef5b5ffc8a61a40f7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 10792 bytes
font_02_sfnt_off0000f463.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 16792 bytes

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