Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecd5eb5d9e4a99a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 19:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cce3fc21f6a1746a92a29711ec5893fe SHA-1: 23f564c28aa05b66b70d2417463c252895504947 SHA-256: cecd5eb5d9e4a99a2d2182062ee5ca21e73d97df1c12be5ea06b0747aa52a664
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to obscure the true destination. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inphilong.com/upload/files/89776362632.pdf In PDF document text
    • http://geofer.eu/userfiles/files/79465870201.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/volazudafinuzesibisotadik.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/87684629317.pdfIn PDF document text
    • http://fnathservices.com/upload/file/bivosaxagalumejagakupaxib.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4a8b8fa8---66940132497.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/ruxijebokagapenepoxavebi.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/sanilamubiridorowo.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/54093123824.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/jopunilosop.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/17178148789.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/39568005179.pdfIn PDF document text
    • http://lachina.cn/upload/file/xujuporogepegusubu.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/xamitinid.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/nuvomukitanofesaj.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/lazadirisirekidobemaza.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5t59eq6ro72gj88sq7agve22s3/vimuboguwotoravenoxobe.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/xilubadadisujefuxaxatarit.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/watipanajulonoxukukawovoz.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/26650610122.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/xuzipupedata.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/48087328324.pdfIn PDF document text
    • http://terrietanaka.com/library/files/25811941464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mini+militia+hack+download+appPDF 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_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 10552 bytes
SHA-256: b8ad0b4b78e5dd5200e2600853e359dd02c0bd57db7b1c83fbd60a9474a1de20
font_02_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 17456 bytes
SHA-256: ba777c85773823773edfad0897da1bba86cc2160c963f6f33bd715ade106a3dd

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