Malicious PDF — malware analysis report

Static analysis result for SHA-256 caec3ad515d49aa6…

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 07:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9da1f37da27b35ad7ce5f92abbf6b0ee SHA-1: 56ff4e52daa0b996d73702835af503984a680a9f SHA-256: caec3ad515d49aa64ae20cfc896dd3022fc74dfb988b4fa09c781bad7bbf64aa
146 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a raw IP address, indicating a potential phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or leading users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://vietnaminsight.biz/ckfinder/userfiles/files/vobixitin.pdf In PDF document text
    • http://seamcc.com/UserFiles/files/luzefumu.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210901215837421.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/xeketupizuzogob.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/38458928080.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/46867146147.pdfIn PDF document text
    • http://amdind.com/userfiles/file/makewatezomugerede.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210910_125153.pdfPDF link annotation
    • http://recko.ru/ckfinder/userfiles/files/patumutonimavokemuzo.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/libefozokebuga.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/damekulenibu.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/589843453.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/bazudevaladus.pdfIn PDF document text
    • https://steammining.com/userfiles/file/55642586679.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/bofokawi.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021941331453585.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350597a3b8f---gawalenugolesewagepa.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/32644051149.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/jikogiverugaviwajuja.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/23495201350.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/1835202979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=five+letter+words+starting+with+yPDF 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_off0000b908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB908 10772 bytes
SHA-256: fb10ef97afc2d438aa4bf75ed71bc134120034947806a5a6e7453cc9d783216b
font_01_sfnt_off0000d19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 16532 bytes
SHA-256: aac0ca0b5a5dc44c600c28855dfca076090448a40023e3393c08074b38489f96
font_02_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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