Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04dda925f751db0…

MALICIOUS

PDF

68.4 KB Created: 2021-09-17 03:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 21ce2fc62ef287f098ff971fe7685956 SHA-1: 948d814f70a1b39bbeaa75b38fe2c98710bbd2d4 SHA-256: f04dda925f751db0b81d1bdff7a33a2032ceef7b9a264726b9823d152c8de9e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://chcial.ru/uplcv?utm_term=atorrent+pro+apk+download PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613277b1141ff---xisumenonolovuf.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/faponilamizetalojafudedax.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109141919172669.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/baguponidaremab.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/66759167896.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/37986664777.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/bunozutojoxizunakete.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/70573882902.pdfIn PDF document text
    • http://hkalc.com/userfiles/motimamipalarezunokazowul.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/xexowon.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/9164105471.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/42017877148.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/9439361466.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/68287695888.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/68803433104.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/zubewipuzakezinuk.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/55200859587.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/mefubudogilugezidazu.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/xaburotuwuka.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/vunifurel.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/91731681196.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/53086814908.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/wapatotibuwepewomowovibij.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/18891037644.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/lativikitewipinuvegules.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_off0000aecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECF 10284 bytes
SHA-256: 30cbdc532c2740885938ea3442e48160877bff513b48a6bd5ee64622a55aaf52
font_01_sfnt_off0000c620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC620 14484 bytes
SHA-256: 9e3b18a0f1388352def2127fab6430918ac9747ef910acf37f622c580ceef587
font_02_sfnt_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1