Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61baa456f3dbcf5…

MALICIOUS

PDF

78.8 KB Created: 2021-02-20 03:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 776a5defeaa565887042e49998c7a1c7 SHA-1: 9115da615243d3c9f7d70174a114e4e2ec70fe63 SHA-256: a61baa456f3dbcf57a1429f0aa9b8c7628535bbf34d7a5a578ce89b9c1a4fc00
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, indicating it functions as a link farm. The 'Office manager roles and responsibilities resume' text suggests a lure to trick users into visiting these sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=office+manager+roles+and+responsibilities+resume PDF link annotation
    • https://vatilevemuwaji.weebly.com/uploads/1/3/1/4/131453872/bamek.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/cad657ac507e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_5fe73d161bf4e.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/1292558.pdfIn PDF document text
    • https://kazobutuzag.weebly.com/uploads/1/3/1/1/131164075/tuzanevoradulasaran.pdfIn PDF document text
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/5698032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_601c5f7bd29a2.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/rqjjjaP/rigirixuboruxow.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/gdcjegh/kewus.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/id5tBVW/xojozukibuvotut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_6015b78a4b68c.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/A4ijoih/niwonotoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502833/normal_5fcc608ff114e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rupiroliwon.epizy.com/mununolurijov.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/how_to_auto_images_in_outlook.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/historia_de_un_amor_violin_sheet_music.pdfIn PDF document text
    • http://daboloxasorun.rf.gd/how_to_boost_upload_speed_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/last_cloudia_beginner_guide.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_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 5640 bytes
SHA-256: 2f56e93c260cc2a8d1c019ffd1910e1eb9d8da5dcac9eca0b3620418d607e2ec
font_01_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 11404 bytes
SHA-256: 24b5825d9a9b300342c66c5f83397100857897c245a9046984f6e6360fbd6308

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