Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f09d07384e3f642…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 15:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5aa03e9cc3a141b5f423c5742d6b0742 SHA-1: 3be02159b61b2e349c1f47f6437d27c15d53aa60 SHA-256: 6f09d07384e3f642dcc459d9d51d1808bd2fab7a1f03c499134b8b2ed160a7bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=monster+house+full+movie+online
    • https://ardiinerkh.mn/uploads/userfiles/files/51442250072.pdf
    • http://www.sctiec.com/up_files/FCK/file/47412667647.pdf
    • http://oio.cn/uploadfiles/files/26029430897.pdf
    • http://skkouty.cz/ckfinder/userfiles/files/32614560412.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/mezebiki.pdf
    • https://wecareprogram.org/images/file/30253141142.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3ebb58dcca17f26fc1eba39ac88629fc/76343922624.pdf
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/97924632214.pdf
    • http://inbjnews.com/data/cheditor/0603/files/32557765910.pdf
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/dewevorufa.pdf
    • http://bioaec.com/userfiles/files/nizuvivanamasidogitoves.pdf
    • http://hasdeu.md/data/userfiles/files/gozexexetijiduwigubuj.pdf
    • http://bright-inter.com/file_media/file_image/file/14994674104.pdf
    • http://yanartekstil.com/firma/files/getakuwuxopoxometu.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1630506967.pdf
    • https://vinamex.info/uploads/news_file/28557216623.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161368fed084eb---xovuduzag.pdf
    • http://manu-transport.com/documents/file/95502093803.pdf
    • http://avanti-kuhni.ru/upload/files/87081724400.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/repixesekumudetomijix.pdf
    • http://dailymaydemtien.com/userfiles/files/85901160223.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_off0000d283.bin
d569c8807e1d70235acccd8807c8b37c5ad31617c41cfeac17f5ede3da134c77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 16828 bytes
font_01_sfnt_off0000fe29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 16792 bytes
font_02_sfnt_off00011640.bin
963b70ce75bedd16f384bcb09c3f5273173017126a02d1dabe957aefd76fa79d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 10476 bytes

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