Malicious PDF — malware analysis report

Static analysis result for SHA-256 8659a3bee4dba2ea…

MALICIOUS

PDF

78.4 KB Created: 2021-05-09 06:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 70824abd342c8bfcf86b11daccc57970 SHA-1: 29142e598c5d5f7c8e0db83ff68b2f5cf8be298a SHA-256: 8659a3bee4dba2ea900415951e0d8e0779a3a1961914d6dba6676d14c1de3801
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to spearphishing attachments leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=tribe+on+homecoming+and+belonging+review PDF link annotation
    • https://nunavataregexo.weebly.com/uploads/1/3/0/7/130775742/fd9d11cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd1cb3a8de30.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/1adbf6c291.pdfIn PDF document text
    • http://jumovuv.22web.org/60137479107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5fe140346a4b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_5fd6d69c34e15.pdfIn PDF document text
    • https://wawurekufa.weebly.com/uploads/1/3/4/3/134322490/5929184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378834/normal_5fca83b78a114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_6066239e8eae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_5fd7c4be83217.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/00c24c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vopepajip.epizy.com/buxurupulezewej.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_ec328fe178b14abf9ea613873688cc44.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_f16877e43d1646c4b9b888ce677a5721.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_cfbc4533e33e41388b6d244518842b19.pdf?index=trueIn PDF document text
    • http://wisotujapu.epizy.com/campbell_biology_9th_edition_2020.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_59a9714650c347dabea702952e941a45.pdf?index=trueIn PDF document text
    • http://kosatalek.rf.gd/tosonariv.pdfIn PDF document text
    • http://bejutamukedus.epizy.com/cours_anglais_4me.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_6325ec91847949e5b837fcb2680852f6.pdf?index=trueIn PDF document text
    • http://sazurukoxoje.rf.gd/29009466772.pdfIn PDF document text
    • http://kukatunudivolu.epizy.com/92980306125.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_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 5416 bytes
SHA-256: ed1684847e64f7042dfd95243d63fe11748995bcc76f1159b5057ee25f21bf8b
font_01_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 10804 bytes
SHA-256: ac5bc613917096ed75add980fb2309abf6bade4b2c4e4bf14228772caceaae1d