Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc318bb758d9a571…

MALICIOUS

PDF

78.0 KB Created: 2021-04-02 12:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6236346cc2d1bf6d295199fabca2fc95 SHA-1: 7392bf8a0e16bdc6738aba119b8169471be17a26 SHA-256: cc318bb758d9a57156d02d8124fb9511b0f384d422c4209075dcb81c048c9777
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution 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 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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=how+to+file+a+claim+on+t+mobile PDF link annotation
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/a942683.pdfIn PDF document text
    • https://jupedarer.weebly.com/uploads/1/3/2/8/132815187/29ae794b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425217/normal_60035626f144d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403131/normal_60305858549d9.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/7971367.pdfIn PDF document text
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/1380210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6012b1e447824.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_60020670cd325.pdfIn PDF document text
    • https://dodagifudawawub.weebly.com/uploads/1/3/4/7/134750091/3447214.pdfIn PDF document text
    • https://kazowajobizitat.weebly.com/uploads/1/3/0/7/130775795/2b7bf8.pdfIn PDF document text
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/4621350.pdfIn PDF document text
    • https://wigikezidewuti.weebly.com/uploads/1/3/4/5/134578964/5a505b2d17b.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/70a38d59.pdfIn PDF document text
    • https://bowilidorufe.weebly.com/uploads/1/3/4/6/134603038/62d165e30b499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5fe7bbd350a01.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/tofurapulug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_155b510efce84ce0a9cb2cc201256ef4.pdf?index=trueIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_45eaa7cdec7143328d547036cd082394.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_762028f379f447f2a586de0f85b90c81.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 4944 bytes
SHA-256: 5e6a59016c86869a6cc49263973eef1ae6843581c01f942415a757c15cedf54d
font_01_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 11156 bytes
SHA-256: 3a7f40849aa4a13d0348423d3c2e1c03b1efd22a25e1b49a46014bd7c7952e14