Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbeec0962c1a52d6…

MALICIOUS

PDF

76.2 KB Created: 2021-03-09 10:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d81f9f7372af4f755b93471cab1c7630 SHA-1: d0233079aee741c07aebdb723e4dfae345372cc3 SHA-256: cbeec0962c1a52d6c5016c7212fd59dfe7d5c0deb23923ac65cb772031b9af76
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to song lyrics, likely to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=lyric+justin+timberlake+can%2527t+stop+the+feeling PDF link annotation
    • http://filozajerezabi.getenjoyment.net/sununusabi.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/1855182.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/eosinophilic_esophagitis_treatment.pdfIn PDF document text
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/1ffef94f7b.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/39454766736.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/3756075.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/dd_food_ideas.pdfIn PDF document text
    • https://wotuvinuvokotar.weebly.com/uploads/1/3/5/3/135330473/jesisigopoliv.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/manual_asus_maximus_vii_hero_espaol.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/55559044819.pdfIn PDF document text
    • https://diporatefumidal.weebly.com/uploads/1/3/4/4/134489634/dff90e52fc.pdfIn PDF document text
    • https://teselabobebivu.weebly.com/uploads/1/3/1/6/131606188/tosezodolodoma-purusekajopegaf-ripuxuwevinal.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/reinforced_concrete_design_textbook.pdfIn PDF document text
    • https://tebifenan.weebly.com/uploads/1/3/4/6/134675993/1266936.pdfIn PDF document text
    • https://dazuzoboda.weebly.com/uploads/1/3/4/0/134017564/pusim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/dudaluvelojokojew.pdfIn PDF document text
    • http://lijowavatajo.myartsonline.com/xodigateziriviko.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_9a9701cae05440e5883162bbd23fe56a.pdf?index=trueIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/how_to_reset_spandana_password.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_54fbcaf374da4cc3836abdb947f89944.pdf?index=trueIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/how_long_does_it_take_for_a_black_and_decker_drill_to_charge.pdfIn PDF document text
    • http://rixibedi.onlinewebshop.net/lowuxu.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_1677acd1424c4decae77bd2e8af2d40a.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_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 5784 bytes
SHA-256: 8f1c8334022a22743b9e0b2cb336d5361149f478f2d174f9c19a784af0336ec2
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 11156 bytes
SHA-256: 8b483ef1e4f9bf67f1316b912c8e26afa2413cb26491b96df7e58aa6a6c62b34