Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb63ca036a4f25da…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 19:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ca36a78847143ca052734eb7b495421 SHA-1: 058da3cf60787c209498906c69aa1ecc8274e0c1 SHA-256: fb63ca036a4f25dab07b23dd16a4cac67717ff4c2f92971dacdf34a140b5ea9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, likely leading to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://mylivediamondinventory.com/uploads/files/67318296437.pdf
    • http://ccshecea.org/upload/files/wezajawego.pdf
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/nirevutapabetibog.pdf
    • http://thienthaopc.com/upload/FCK/file/49385540882.pdf
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/77409430830.pdf
    • https://llibreriaha.com/img/events/file/10812556233.pdf
    • http://khachsandomino.com/hinhanh_fckeditor/file/99442116061.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/lifoguvinaluku.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/jofujateminat.pdf
    • http://acsalma.hu/userfiles/files/44159450280.pdf
    • http://rkenterprisesonline.com/FCKeditor/file/gesowirenidopixaju.pdf
    • http://newo.ru/files/files/kebujabubexebopizevojaje.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee19419ab---gepakazugitut.pdf
    • https://caraudioshop.ro/mm/file/19663084450.pdf
    • https://manenshop.com/upload/files/84323381438.pdf
    • http://reutlinger.pl/userfiles/file/72037078238.pdf
    • https://fajanav.com/aym_image/files/begutazuxunuputikasilux.pdf
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210910002315.pdf
    • https://penmypoem.com/new/admin/uploadfiles/file/julufunuxomeletix.pdf
    • http://mobilahomedesign.com/userfiles/files/papedutubekidez.pdf
    • https://maximatrimony.com/ckfinder/userfiles/files/50327703362.pdf
    • https://brihat-group.com/assets/userfiles/files/53245243518.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=phone+id+faker+apk+download
    • 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_off0000bdc6.bin
a96c8db2dd668424e2cfcfa0504dc019fe9c894c49274d0e55df1f401d75d41d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC6 18224 bytes
font_01_sfnt_off0000ed9c.bin
4a6c188927971390f1e06a8d44877768955a684117610a6114010b6b02951fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 10508 bytes
font_02_sfnt_off00010572.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10572 16792 bytes

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