Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6d233215713c66…

MALICIOUS

PDF

86.5 KB Created: 2021-03-19 23:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff8b78585ad4ef9bfdd973d809048ca7 SHA-1: 9e102a4f4fd19b3ce401b3f659dfd7857179ee8c SHA-256: af6d233215713c66d3c8eb2ce2889204fdc82bbdfc1980bddf9ef92a8cf93ee2
134 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. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/strik?utm_term=manual+software+testing+course+syllabus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365580/normal_603374a01a56f.pdfIn PDF document text
    • http://xegomivuz.iblogger.org/piano_standards_sheet_music.pdfIn PDF document text
    • http://legendbilisim.com/20756091856t8zjs.pdfIn PDF document text
    • http://vosalax.22web.org/21176153127.pdfIn PDF document text
    • http://fimajixilozile.22web.org/fekopenikogasodizikekagig.pdfIn PDF document text
    • http://infonewstravel.com/69222599169tzn2p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_603a628858a70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5fd3cbdc7ab20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2067fad2-3c82-4ffc-82ed-043701637529/dezakijudevatu.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_aad3429b177d44cba43a8b20db3e93f2.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_ce0c27a5ac1b46e296d078838102b0d1.pdf?index=trueIn PDF document text
    • http://nirutavikuda.epizy.com/tv_guide_tonight_abc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615513d3-5580-4a8f-9d25-a506fe22296b/vegan_cookbooks_2020.pdfIn PDF document text
    • http://namasabelugag.epizy.com/95794362771.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_0a5f4bbfb7a44c8389aa0ad7efa9d994.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd84bded-4465-4067-b3bd-9fa928fde800/gujuf.pdfIn PDF document text
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_702518a47b384fb78f0c76c3de497556.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4269c34a-ad03-4bc2-abac-2d8a87c17b30/71530155630.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 5268 bytes
SHA-256: 919aeb5ef58ba5dc50cb56295d831f185aa0bbe52519b1a98f05046e08739284
font_01_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 11192 bytes
SHA-256: 7a73eda89124c12bbeb94625a2911a60bd9836b9f47d91f038f8064b20aa6758
font_02_sfnt_off00013e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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