Malicious PDF — malware analysis report

Static analysis result for SHA-256 b128b3437ce6cf6e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 22:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db2c164c2a8e1a60d204654b3ca8cf69 SHA-1: 59becf8b358199f8722033bbbe6d853b5e8eb686 SHA-256: b128b3437ce6cf6edde07c07179e0f2c3ba1a69905c175744da9681725d3d82f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external domains, many of which are part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using disposable hosting and UTM parameters to obscure the true destination, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=download+getting+over+it+android PDF link annotation
    • http://agisinfo.ru/uploads/content/files/kuzirerilam.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/xegazidaf.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/64878623841.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210908195336.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/55317636769.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/50777904665.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/kudamamekilubufe.pdfIn PDF document text
    • https://ms01bet.com/contents/files/kibemejavugufuwudipetula.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/tewobokapaxovuzimapu.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/lijowawijorigonuxusok.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/repoga.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/lavazobosubuwiner.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/48414024495.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202193194699482.pdfIn PDF document text
    • https://kildevangen.dk/files/28022097150.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/53438290842.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/63435610013.pdfIn PDF document text
    • https://schmitz.cz/res/file/romig.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/fotominerugevatoruneguj.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/51433468979.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_off0000b664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB664 20204 bytes
SHA-256: 5c66aec9f7a40ee90c9b309ae4e246b8284812bf9c6024d24c5cdaa7a7b9f1bb
font_01_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10408 bytes
SHA-256: c3471b3354b8ff1d6cc4ecb65f35a0413c1271f4bc7bce563fc658ea9b9c6c0f

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