Malicious PDF — malware analysis report

Static analysis result for SHA-256 668840134848d9e3…

MALICIOUS

PDF

101.5 KB Created: 2021-05-05 18:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2cff290455794d2f7be486a3e59a5fb2 SHA-1: 2b758e824b14657128fdad72fe011371611de867 SHA-256: 668840134848d9e3a00eacbe003696ac5dba3854e412331eecee35bac24bc7d1
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-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://jumiwimov.ru/strik?utm_term=david+rockefeller+memoirs+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370074/normal_6047b8042351b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470401/normal_601bdd8b11acc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_5fd2d72b67984.pdfIn PDF document text
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/jokarugov.pdfIn PDF document text
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/9424085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5fd61eac1df70.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/piwupevivotixi/1464226592.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_fb35d32806b84a6f995e9004e031c206.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/disosomesexivuwok.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_17dcac8f46a9481aa54cfdab30e85e7a.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_56765f8947fc4bd4b7596a9f05d7c591.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_a37dd91ebb764d418a374a43e8580883.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/xebeguta.pdfIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_53b72fffcb414e24a243cc5b4c13b5ce.pdf?index=trueIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_20f0459d95624b43a812048719788b8f.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_4c39293d875c43749d0f1b65edaa9747.pdf?index=trueIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_4c6aa15e732649159e57c3c6684f816e.pdf?index=trueIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_51af8b2530a64a019e73eb6c62353ce5.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_8f9843443b5241bd8acecc6ffd6de568.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_3d79837302474ec18fe876d9ca646363.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/22783910407.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/neon_genesis_evangelion_piano_sheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D65 5516 bytes
SHA-256: 57542b3176538160f38ab39a1440fceb0cb6dcc7ddf3f96980c6ad12363b29ab
font_01_sfnt_off00016034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16034 12124 bytes
SHA-256: 60bad34ebf66262b51d2f50b2ec0a5407b2198f4198db79c757b3eec7789b41b