Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b0fbf2ead9cdf1…

MALICIOUS

PDF

86.5 KB Created: 2021-09-13 03:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 446f4e9a9dc13daa8879d1019aaef835 SHA-1: 9f43be05e2ad3aaae0ee7db2a721773e6fd1c8fe SHA-256: f0b0fbf2ead9cdf1cea9d4408e10614688e45156265c2bcc6cf1e9269880dc7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful sites, possibly for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://capthepcongtrinh.com/uploads/news/files/48194686916.pdf In PDF document text
    • https://fsreloading.com/userfiles/files/medufid.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/6074913881.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/23751111381.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/42020732226.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/58217979608.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/471253498.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/lakiboxenason.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/gitivejukizagijej.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/48890770235.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/kefupenajititojebufemi.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/90333695146.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/16805067130.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/73683090575.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/16488416966.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/vipupututamasa.pdfIn PDF document text
    • http://hidropro.hu/upload/zamasavesenafapal.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/xagakan.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/mibudabas.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2567dead---pukonadutujidum.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/sigumunitife.pdfIn PDF document text
    • https://nada70.org/userfiles/file/tinuzibitujoduxigokokaw.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245abcfca1---12463566.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/13864545759.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/senofiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=budget+planner+for+androidPDF 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_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 10660 bytes
SHA-256: d1c690a1f63991a7af76dd090557837c707f716be8262ab6edc2e24d807284e9
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16960 bytes
SHA-256: 447c47cee3f180d37d25f43eb79c7c72402a2c36e7c6b9dbdc8d7cb8972c54b3