Malicious PDF — malware analysis report

Static analysis result for SHA-256 27089508042c5c42…

MALICIOUS

PDF

100.9 KB Created: 2021-05-28 08:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6391dbe99f966f2311a72728c9be5929 SHA-1: 89d0a9b97842b952f0c38192dbb5ebb80918fed1 SHA-256: 27089508042c5c42ca07b3a8401a997ec6d8401d0865a83e5090fa91faac94d9
186 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 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 0.9997

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 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.
  • 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=dieta+para+ganar+peso+y+masa+muscular+pdf PDF link annotation
    • https://wemedasexokava.weebly.com/uploads/1/3/4/5/134512162/1918266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489993/normal_6056f5bd05a8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_6018e5cd61e6e.pdfIn PDF document text
    • https://namovanuzo.weebly.com/uploads/1/3/1/6/131606642/pogupuwulugi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5fdcb61c9fcaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_6059025551037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_5fd0fafdc699a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_601bb182e0ecf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fcbc5bff37c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_606542c7d010e.pdfIn PDF document text
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/4f6d92ff47c.pdfIn PDF document text
    • https://nivozigagu.weebly.com/uploads/1/3/4/4/134439663/pofodi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495988/normal_5fc8054cc22b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5ffcf826da87a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4381294/normal_60afe781ce57b.pdfIn PDF document text
    • https://nonufovoda.weebly.com/uploads/1/3/0/7/130775853/limujorineg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_603caa0b4ef69.pdfIn PDF document text
    • https://wajatajosow.weebly.com/uploads/1/3/4/4/134487766/fakugomum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0a06de-5583-47a6-8567-765e0f0478db/adobe_premiere_pro_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2aeb4e6-225e-41b5-a6c8-336192c657f0/fujebonozutunede.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_off000140e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E7 5576 bytes
SHA-256: cca1760e628c3707b77ce3d47d6a5a7427a717fcac93bc952f71f9af6c7112f6
font_01_sfnt_off000153d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D2 2092 bytes
SHA-256: 78e94e2e47178245ca437e301e19f50dc99845ecc02da2ba30fe2b1e34051cc2
font_02_sfnt_off00015d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D77 12460 bytes
SHA-256: 3146398063d40acab55c278f3519642b6d8b043feab45b5ad768a9045f2bc5e9

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