Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ae630c05849c52…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 23:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 02de1eb1e5928cb3f0aec2867b86f985 SHA-1: 4b805bcd3ed7206be8db08cd9981626fc9b59001 SHA-256: 40ae630c05849c52c9d04ba9388317749ffdf1e03ae1c2c4e249e3979a7ca814
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it is part of a link farm and uses an MFA lure, suggesting an attempt to harvest credentials or session tokens. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the overall pattern points to credential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://b40555.handyfriendship.com/upload/files/67081813185.pdf In PDF document text
    • http://jingluo.net/uploadfiles/files/lozumawusirevunudufuvi.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/30635647126.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/xizikuraxubetubunuseru.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/38967619326.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210909071550668.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/85711663432.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/tejewuxut.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/41743300826.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/99843807400.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/73054453995.pdfIn PDF document text
    • http://klhl.com/userfiles/file/nilakopok.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109270114069271.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/kulawuvizajajanuwige.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/84263197921.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/48894490047.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/woxilubinejotu.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83566608945.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/zurunodotufakovamowewexix.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/73517909862.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/rulonotimiketeb.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/89447903886.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/4166442011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ben+ten+android+game+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB177 10560 bytes
SHA-256: fbdf70278fb39de7abc0bb3462a7b942294f73ddfe61e02017c28dcb7ef44305
font_01_sfnt_off0000c958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 15768 bytes
SHA-256: c2d2a6ff6890fb46779b2047f0e5e37959be0a67909cbfbdb94cae12a7032126
font_02_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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