Malicious PDF — malware analysis report

Static analysis result for SHA-256 be27b2546471cc7b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 21:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b3fafd0665b71acc4a4b973306a919f SHA-1: b187dd16a4858c45f285ac14f239d715367ddbf6 SHA-256: be27b2546471cc7b678ff33c2268f825a50a886ddd587c491101870ddd6f59a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.zywawiara.pl/pliki/92476568140.pdf
    • http://centrons.com/uploaded/file/2175743606137f975b31a2.pdf
    • https://tonthephunglan.vn/upload/files/77290154945.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/95974986677.pdf
    • http://tuivaivietnam.com/uploads/files/46990252285.pdf
    • http://blackivy.pl/userfiles/file/legirutewabalafemetiwodu.pdf
    • http://xiangzhuan.tw/upload/files/43925320433.pdf
    • http://bonezi.morefriendship.com/upload/files/51997401606.pdf
    • http://northmarking.com/userfiles/files/8262161289.pdf
    • http://vidol.eu/userfiles/file/moruvojamizedanozido.pdf
    • https://cailux.lu/userfiles/files/23466212229.pdf
    • http://topaslt.com/userfiles/file/gopuvixuwawoposibazex.pdf
    • https://texasbordervolunteers.org/userfiles/file/41333425183.pdf
    • http://rund-sro.cz/UserFiles/File/75985762871.pdf
    • http://drzwiukryte.pl/userfiles/file/51194621002.pdf
    • http://gotween.com/userfiles/file///38042102765.pdf
    • http://xn--q20b13r9leepaeb.net/upload/file/202109030351346130.pdf
    • https://mtmnetwork.net/uploadEditor/files/nokimufuwolosogafapelap.pdf
    • https://akapacha.com/userfiles/file/laludutixomawolitetag.pdf
    • https://booknowrentalimo.ch/userfiles/files/foluvirajij.pdf
    • http://amongelite.com/ci/userfiles/files/bovitimupinexizes.pdf
    • http://www.pattyn360.com/upload/forum/files/79650096763.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+into+iphone
    • 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_off0000b7d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D0 16792 bytes
font_01_sfnt_off0000cfe2.bin
9a2ef6c0080def0eb8a81938546b3226b976072a8c292eb1093c9f7b1c492b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE2 16424 bytes
font_02_sfnt_off0000f9af.bin
969ae95ac5c296f1bc5b7ccd4288725fa40cafe0ee35561a389d5cf1dc7963b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10096 bytes

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