Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b94bbb8a4a756c…

MALICIOUS

PDF

68.1 KB Created: 2021-03-28 23:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7b27e5ce332c17f0a2e60ec10895fb41 SHA-1: 53ea895c1fab1f24cc5bb74b24a1b9adbc2cad05 SHA-256: e8b94bbb8a4a756ca97974c07ace52a90decb881a107df54c78d3e4450cbcac2
186 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=graphing+systems+of+inequalities+word+problems+worksheet+pdf PDF link annotation
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/9157227.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/vekedugajurixenn7qn1.pdfIn PDF document text
    • http://susojatafumo.22web.org/lasobo.pdfIn PDF document text
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/4341419.pdfIn PDF document text
    • https://tedejewudokas.weebly.com/uploads/1/3/1/0/131070167/d6c0f3614b23d0.pdfIn PDF document text
    • http://naturapple.space/men_s_fireman_costume_hatimo3t.pdfIn PDF document text
    • https://sudarixadozitot.weebly.com/uploads/1/3/5/3/135331315/69321.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/c6d82962-5268-41c3-9f66-8ee4a56b3d41/nosagumijolirilar.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_49063357496a41839c21a0011959265e.pdf?index=trueIn PDF document text
    • http://joluvolob.epizy.com/vopuzufijumewaf.pdfIn PDF document text
    • http://divimoxigorube.epizy.com/64211949473.pdfIn PDF document text
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_7ed088eb5e1f4688b0d2c3cf7251c406.pdf?index=trueIn PDF document text
    • http://tidefos.epizy.com/chevrolet_aveo_2011_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e956408-74bb-4e36-9478-4f1fa6eb11ce/wifanuxadugad.pdfIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_d4d3934587fd4f65af8712d09a22eb65.pdf?index=trueIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_7564d23469f84b37a78ea31a0207c3fb.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_95b1588d50544249a1b253eff988898f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7943febd-7ffb-4456-b13c-64ad0a977613/siduguginuwoxa.pdfIn PDF document text
    • http://dolifusekaxug.epizy.com/60685521416.pdfIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_56b1898872d14439913afc9287ba2349.pdf?index=trueIn PDF document text
    • https://8f59ffc6-1281-4225-bf60-9833eedd4ad8.filesusr.com/ugd/e3c460_faa512ec0a49461c84a2759ab5defea7.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_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 6008 bytes
SHA-256: ad24727bffd8ddeb19273da60ce14b15de325aa9a43a2f6d6f689f037d2ea3e6
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 10164 bytes
SHA-256: af5cb668591f0b2e90900199dbe27db65a0133fb6e6a3fcf493f8b36095a1669