Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a8cd3f7d6d52d7…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 22:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a952638c706d2191f4778e7c5584f18 SHA-1: 68e7667ba16f139ba38f5c915fecc85970e6a061 SHA-256: e1a8cd3f7d6d52d719f05554d19ff43f191f618efb970d412d3c3181c959dc8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://krisoc.ru/uplcv?utm_term=mod+menu+for+among+us+mobile+android PDF link annotation
    • http://globalfeedindustry.com/upload/files/34927482214.pdfIn PDF document text
    • http://esejsc.com/upload/files/rimexurimef.pdfIn PDF document text
    • http://teakdeck.pl/files/file/78969193004.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/c3d98e.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/kitofapaxagemizona.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/11106900036.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/56066290311.pdfIn PDF document text
    • http://stevis.cz/files/file/nomoverotelerodedotoxub.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/befafikabevaw.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/selopupela.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/18648525627.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210923160524.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/93910286570.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/tolumokupikaxu.pdfIn PDF document text
    • https://gozdekadife.com/resimler/files/bejaratovifu.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/62829890681.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb21d47827---nulizuxi.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/18969803048.pdfIn PDF document text
    • https://medtek.vn/storage/file/8198659766.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/62218973598.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/91989475642.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/jinawudebuborasawubujeka.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210913015620554.pdfIn PDF document text
    • 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_off0000afd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD8 15880 bytes
SHA-256: 6f04d1c54ffac0e01a4c33923fe4e570a088796e4359297398efe09ea48f9506
font_01_sfnt_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 10832 bytes
SHA-256: fd631a31923e01d4b740aedd269b7dd0b555e43327dda7d159e8e0a32f4f9854

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