Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c312330b2bf654…

MALICIOUS

PDF

72.3 KB Created: 2021-09-29 13:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 296b13d8e9aeca60ef745ace0ce51b0c SHA-1: 7b615f6bb1b3733b2048d85e7e1bc226405edbf2 SHA-256: 54c312330b2bf6541f8efa8ce864cf47f0f1f1f926af962fa780762571efd639
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bellamy.tw/uploads/files/202109252211497368.pdf
    • https://amursvoidom.ru/media/files/sebazozezotivo.pdf
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/kolixunes.pdf
    • http://noahmission.org/dataroom/file/zutekemeboxulox.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40659905922.pdf
    • https://nbtele.com/en/cache/fck_files/file/nopepi.pdf
    • https://groupunsur4.com/contents/files/mejokuturitopokaga.pdf
    • https://ptogel1.com/contents/files/73645626352.pdf
    • https://happycolaborativo.com/uploads/files/52370700548.pdf
    • https://istanajpdua.com/contents/files/92428350237.pdf
    • https://zlato-stribro-investice.com/upload/files/tisifizosogutuseperebe.pdf
    • http://abwingssuffolk1.com/uploads/files/18228181272.pdf
    • http://worshipedia.net/sites/default/files/file/lalirejexakuralewemupuf.pdf
    • http://tznjl.com/userfiles/files/menuzejanisuwuvinokiz.pdf
    • http://phrabat.net/UserFiles/File/gukurujaja.pdf
    • http://stisk.com/file/1341385415.pdf
    • http://gdlejia.com/uploadfile/files/20210915_225124.pdf
    • http://sten.kr/club/data/userfiles/file/20210902165003.pdf
    • http://hak-al.com/resimler/files/lemunedodiruwero.pdf
    • https://soudurelauziere.ca/upload/editor/file/gazonedokoninatigemelu.pdf
    • http://khangvietdn.com/uploads/file/31109860954.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210903_324F5C866050FFD8.pdf
    • http://benthanhsgfarm.com/images/uploads/files/bowufapusibo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+block+a+website+from+opening+new+tabs
    • 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_off0000b44c.bin
be7ecc4b5ac743b07aae1bee958471beab09815b52f0aad44fb072a358a9466a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44C 17576 bytes
font_01_sfnt_off0000e12e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 16792 bytes
font_02_sfnt_off0000f945.bin
a9a92d9b4d7b29c0b7f88a65ebd6d652e7ae49dbb75b4c832926e1424bd339f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 11132 bytes

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