Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae60ad453c56a540…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 12:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c1af1d465faf47e5837cd744e1b094c SHA-1: ba01b29fbbdbb63f655c257581cacd2316f1f8e0 SHA-256: ae60ad453c56a5403df09a240c2ff0ffe4ba18d4323df2bb89a0097da1a61725
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a likely phishing or malware distribution attempt. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://drafthe.ru/uplcv?utm_term=house+of+fun+free+coins+game+hunter PDF link annotation
    • http://greathorserider.com/ckfinder/userfiles/files/zejafobavemagarivobota.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/fuxinujanomikimigigukida.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/37817524344.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/12588357863.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/fesapufuwi.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210918_58BD6DF06ABCBC3B.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/xipebax.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7df70180---89926626181.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/64115098364.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/2c51482555bf089c2e8475d9ad80901e/lamisaxiworirivofu.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090901191793.pdfIn PDF document text
    • https://wecareprogram.org/images/file/dejopi.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/renemiguzuzakifenowozadeg.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/zofedenowakixabaxeg.pdfIn PDF document text
    • http://cbstav.cz/file/35771015274.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/17102375502.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/44436042192.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210901052306_2125871976.pdfIn PDF document text
    • http://test-immo.com/file/zigazumemujix.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/43502029536.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/53917896547.pdfIn PDF document text
    • http://etre-belle.su/images/file/38676176947.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/wukaforaviwenedu.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/29946026266.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/zijupifojijefenudikudigux.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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 18484 bytes
SHA-256: 11326a3c2300c62d0a8ac41f8eecf385a95eb2fd7e187c32d6aedf029a3a756f
font_02_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 10828 bytes
SHA-256: 6ae152f738d8330f3aabdec41c28a7aa2d27d870a3ba5ab8ff97accb80e73a91

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