Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00a34223d5ec7ac…

MALICIOUS

PDF

72.5 KB Created: 2021-10-05 19:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee62a467421726aac7dc891f20a8f5d9 SHA-1: 3f1a19bd9e7955518b30f49928c3234bab358df3 SHA-256: f00a34223d5ec7ac9bb0d8847651f0a5ba777803bd7e5d00412ee5f2f0fc1efa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm designed to obscure the true destination. The presence of external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nbc.com.vn/ckfinder/userfiles/files/mewoju.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/kozinefutiludifenufamuvi.pdf
    • http://lustigersteirer.at/userfiles/file/84539851448.pdf
    • http://ngocphuocjsc.com/public/default/ckeditor/files/tirodululubimivojona.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/fovasabidubizetekolumalo.pdf
    • http://orsini-blasioli.it/userfiles/files/56970332125.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/fijowag.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/gabugobi.pdf
    • http://okfilm.kr/userData/board/file/82439570707.pdf
    • https://artgallery.devctn.com/ckfinder/userfiles/files/62414969846.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-23/20210923163346884675.pdf
    • http://maximaviajes.com/FCKfiles/file/lizofuxagunubasekemiguru.pdf
    • http://azs-szermierka.pl/zdjecia/fck/file/21586010790.pdf
    • https://cvzona.lt/resources/img/files/49758255076.pdf
    • https://marblobath.com/app/webroot/img/files/balifogupoperifukunugulu.pdf
    • http://protezas.lt/i/File/55905077002.pdf
    • https://vas-vill.hu/userfiles/file/bawunabiwakikoravupitofu.pdf
    • http://prodottoitalia.eu/userfiles/files/gosewokenawemo.pdf
    • http://bk-plus.at/userfiles/files/kaluf.pdf
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/tadimoxozat.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/31404101899.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/xabejajidevewutid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=systematic+identification+of+organic+compounds+pdf
    • 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_off0000b635.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB635 16792 bytes
font_01_sfnt_off0000ce4c.bin
bfeca37df98c2b4bc6d952b322e423b0e5e1cdc0cd2987e7c8d987fa08bcb6f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 11204 bytes
font_02_sfnt_off0000e859.bin
9401388c9fdaf3084c0fa5f9269a35fd11489cdccff9153cc0eec395d80ea8c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 17044 bytes

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