Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec8da6f4445b017…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 18:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94c3aa85696802e69d3576d05d71b02a SHA-1: e963eeb6622508683509449c101f8f6b19b47c27 SHA-256: 8ec8da6f4445b01779c4cb71573a0c8e07c4bddc2c4575cb43931255ccdab86e
182 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 random URL link, indicating it is designed to redirect users to a malicious resource. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from the identified URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d8ddc35d6---53204163175.pdf In PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/34158256100.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/xupetoxovoxufiropowu.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/mugamoki.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/jisekazesexebozo.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/96105341237.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/81704404460.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/gerubibevusagune.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/9823831078.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/17898691547.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/binujowebaj.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/sibuwisevorasogafilovaja.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/sutokesogewobitixenel.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/futinerex.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/dopupuzegitidilafomor.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/16561164146.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/6907184603.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210908_100934.pdfIn PDF document text
    • https://kvizek.excore.hu/ckfinder/userfiles/files/24840430321.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/memaf.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202191263382877.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/ziseginajivuzoj.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/pagojololarazax.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161323a2d1788b---99902855591.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/90932372788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dragon+city+private+server+modPDF 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_off0000cab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 17804 bytes
SHA-256: ca3d4eaa2c2fdd6e490d4473b8fc02903f98133761f4ca9ba04b208d0c5fc81a
font_01_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 15316 bytes
SHA-256: 0af2f4f29e0729794987f27b9430792e55ebea0183e1dfbfa22a136d2e55bbac
font_02_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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