Malicious PDF — malware analysis report

Static analysis result for SHA-256 280eae738d961ded…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 18:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53a9acd554a19dc29c5eab402aa68e3b SHA-1: 477830c4fcc57b42e6ef8c1bb529ef2ddccb08f2 SHA-256: 280eae738d961dedd20602c990d9cfc434ca4fc01430375680d179fa20727602
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the document as a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://onlinendttraining.com/files/xoretifafepaxitipuwumutus.pdf
    • http://datcat.vn/2018/file/24185721444.pdf
    • https://trisyscom.com/userfiles/file/27367996764.pdf
    • http://buren-kompanie.de/userfiles/files/87362415905.pdf
    • http://nwatchonline.com/userfiles/file/18541335160.pdf
    • http://another-partner.morefriendship.com/upload/files/74881079942.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140659361987---wotivegu.pdf
    • http://efuturesthai.com/uploads/file/20342979698.pdf
    • http://kiapelhrimov.cz/UserFiles/File/31022358424.pdf
    • http://www.abcklima.hu/data/editorfile/fidot.pdf
    • http://paulabenveniste.com/UserFiles/file/44114564670.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/5461348353.pdf
    • http://recviem.ru/img/upload/56941444777.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/92950490485.pdf
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/linasimigosibiwamiw.pdf
    • http://wawa757.com/uploads/files/66730226221.pdf
    • http://feuerwehr-mittenwalde.de/mediathek/files/votabete.pdf
    • http://master-vin.ru/files/file/linodeziboxebezumij.pdf
    • http://strahyi.ru/images/file/12121153305.pdf
    • http://mlead.net/images/e/file/noxapolomag.pdf
    • https://betsin.org/userfiles/files/34416932935.pdf
    • http://apisicul.com/userfiles/files/53299811739.pdf
    • https://pfollowers.com/ci/userfiles/files/60216451246.pdf
    • http://abyss.sk/userfiles/file/rivenakuwujosidog.pdf
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/90059549576.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+platinum+iv+checker+code
    • 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_off0000c597.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 16792 bytes
font_01_sfnt_off0000ddae.bin
1dd155655270db6fb448676b0946df78beafc8a6b5da691c06d2476468b5c1ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 10868 bytes
font_02_sfnt_off0000f696.bin
f55cbfed86160b035fec5fe925cff8c87ef624c6652c7a5f111b59031181cb57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 19316 bytes

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