Malicious PDF — malware analysis report

Static analysis result for SHA-256 964c76b55a99cc60…

MALICIOUS

PDF

70.4 KB Created: 2021-09-19 15:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 715ed8023ec77fcb13d5c4dabcd11be2 SHA-1: 6eb3c5f57cdc417eeb3e36a0de76db7ec613f7bf SHA-256: 964c76b55a99cc60f717ed9b7136aeb129a74a3930b46a10cb96217e41a117b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, 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 distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

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://5m-tti.com/uploads/image/files/zezurizutixexesat.pdf
    • https://lifeteacher.tw/uploads/files/202109111019415427.pdf
    • https://31app.com/userfiles/file/54281114518.pdf
    • https://aahs.givingplan.net/sites/default/files/editor/file/xarekodirugotabex.pdf
    • https://igraonica.me/userfiles/file/padaporizasigejiwi.pdf
    • http://delve-cr.com/uploads/95322910525.pdf
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/bovatedod.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e3372a63d6f371d35e4e059f531227ad/fubixisevajisa.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/81021899380.pdf
    • https://advantagelic.com/singhania/downloads/file/84269263148.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/zinipir.pdf
    • http://conelser.hu/fck_uploads/file/15079225122.pdf
    • https://sanruouvang.net/images/uploaded/file/18561772064.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7dc0016e7ebd44182ca1d8777902b636/vigolexurimo.pdf
    • http://jump360.co/upload/files/20210913211829.pdf
    • http://artstudiodesign.it/userfiles/files/xokuxovanezupevepivoturo.pdf
    • http://villaroyalenews.com/userimages/bojuve.pdf
    • https://kokomanis.com/contents/files/zinenogojirikuwoto.pdf
    • http://hhoasis.org/app/webroot/img/fck/file/padonatolawediliberuxaza.pdf
    • https://ardiinerkh.mn/uploads/userfiles/files/17872249065.pdf
    • http://aylincinarli.com/fckfiles/file/gomebogusijibegumuvewaza.pdf
    • https://motiwalainstitutes.org/userfiles/file/21450893341.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=solve+infinite+series+calculator
    • 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_off0000b3ba.bin
26fc35f240e23379b1a57cff420327b4cc577019a82e35eccb4693cbba82a808		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BA 15396 bytes
font_01_sfnt_off0000db50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 16792 bytes
font_02_sfnt_off0000f367.bin
c0da174dba2a46c8bab8d6ed77aaecf7bc02b16c5634f8446c32f701b0cae796		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 10572 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.