Malicious PDF — malware analysis report

Static analysis result for SHA-256 01eb94457155dc99…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 14:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfc8614f2ac0ec0b875187561a498e75 SHA-1: 99b221a48cb45f07ab0eb441004ed33097c51408 SHA-256: 01eb94457155dc990cc9694a6776205602e26476de4cb09961a75f46e8965eca
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high-risk heuristic firing for a link to an algorithmically-generated URL, indicating a malicious intent to redirect the user. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document is designed to host multiple links on disposable domains, likely to distribute malware. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mcserpenti.com/userfiles/file/wefekisasu.pdf In PDF document text
    • http://ruihuitax.com/files/file/70764151259.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/50161254648.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/13/file/20210913_113556_118.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/42657251057.pdfIn PDF document text
    • https://phukienbep.net/media/files/dupekobasisadubuvevamewe.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/rakipavuxakemaforizo.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/nudesefujomukavel.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/mudukavev.pdfIn PDF document text
    • http://bdn10.cz/files/file/55211948046.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/mowipemegafanav.pdfIn PDF document text
    • https://ms01bet.com/contents/files/munujunozawijalipamajunu.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/99745729993.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/29527010098.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7795c59d---savelipufajoxapolo.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/72369995290.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c69325d6a---penavivewowujolamisipi.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109171755081321.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090300123052.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/42049503362.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091700373143.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/24973219417.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/zedudunuvulitu.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/69238023305.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/fiferuwububu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=words+that+start+with+z+and+end+with+rPDF 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_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 10436 bytes
SHA-256: f3efecb689c82a683560b9c657b9e8fe2268336de2caf485766918d4b88135c8
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 17296 bytes
SHA-256: 84f986f7b9ea751c4176828cb272333fd0ed6f84a322634c8dfa01fa17556e9a
font_02_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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