Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c63ca106d2e1b2…

MALICIOUS

PDF

73.7 KB Created: 2020-12-20 05:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fb516e5a2243ebef49236437e4ec8805 SHA-1: 9318adb7050f50daa6433307af038cf08dd23a1d SHA-256: 31c63ca106d2e1b254d42f20ccfe118f573b0a2f98b31c2ecc702e3641262ae1
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/strik?utm_term=2013+prius+c+owners+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425211/normal_5fa4a28d9821a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446923/normal_5fb4e3ae998b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/church_visitor_information_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54038c89e1c4b8fdb3a59/t/5fd20cb299fe644e8a667163/1607601331619/28110316037.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/madevoxifirawuwezajiduze.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/71242543208.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf0ae61e25426e1fdfe6d/1606283438568/mezewepisefebudesatugo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5247688c99b6d37c2d33d/t/5fcd40ab920f47545ba0b557/1607286955889/88234693523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ce132f-70e3-4107-b9bb-00565d6dcd6c/export_google_sheet_to_google_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/kipusolibupaxekulin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aedd0b1-ff99-4748-a9bd-2df9f0d0c58a/91707590869.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/swayamvaram_songs_shoban_babu.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/kaala_teeka_song_millind_gaba.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://scripts.sil.org/OFLIn 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_off0000ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB1 5564 bytes
SHA-256: 8f892672c1d10b553f9447dfc42484e7cd0c859f7015d9bb3adee360bc89721a
font_01_sfnt_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 10800 bytes
SHA-256: 2d5bc855f700d071819eb2d17fc21fce66e3bb1e8dfae886db5a9ae9fd0917e9
font_02_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 16060 bytes
SHA-256: 676c0883841b43d00b7ee9e48740bba0cd0e68334271d7a078f050a57dd23d8c

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