Malicious PDF — malware analysis report

Static analysis result for SHA-256 5670ecd75a698383…

MALICIOUS

PDF

88.4 KB Created: 2021-01-19 02:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 597a2e36a8de6c6c94294fdd79a2faa0 SHA-1: 2b283d222bfe84b4b5338f8ef7b404def3425576 SHA-256: 5670ecd75a698383c6e45c2fb9daf68974edb0690b3897f059794a8eeb498353
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure, likely to distribute further malware or collect credentials. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=ridgid+r24012+review PDF link annotation
    • https://site-1176222.mozfiles.com/files/1176222/average_word_problems_grade_5_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/hjnjj9P/76323746705.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/YGjOgiN/kizoruvubufer.pdfIn PDF document text
    • https://site-1174796.mozfiles.com/files/1174796/ziforosanirefugivubizore.pdfIn PDF document text
    • https://cdn.sqhk.co/meradipuwiz/eL58Dgc/5033261292.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/0hesgjj/98337612857.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/fEoXhit/ruritadediwa.pdfIn PDF document text
    • https://wazeketarawowaw.weebly.com/uploads/1/3/4/5/134587567/6f06a26f9d6bb5.pdfIn PDF document text
    • https://site-1168251.mozfiles.com/files/1168251/sabado_gigante_host.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/rugeguvatum.pdfIn PDF document text
    • https://site-1173168.mozfiles.com/files/1173168/34604163807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doroxokile.epizy.com/35575824894.pdfIn PDF document text
    • http://kozifina.epizy.com/calgary_bike_path_map.pdfIn PDF document text
    • http://tikobonojaxax.epizy.com/shopify_pos_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/72148538823.pdfIn PDF document text
    • http://jojanotesejivi.epizy.com/puzozewujojugujugubam.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_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 5144 bytes
SHA-256: f605611a22fc0bcb69f66f7b4e0f519e4389573d37d5f485be00675e372bf3db
font_01_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 11252 bytes
SHA-256: f2826278dae9a345d3cd44fbc5cbae399b870d7995497c8f69b829865876ab23

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