Malicious PDF — malware analysis report

Static analysis result for SHA-256 266f32bf80caf965…

MALICIOUS

PDF

68.2 KB Created: 2021-03-27 16:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b88a46b5ac4e709249def14396e10e93 SHA-1: 233e94222ff52b4981a40e1f8a3d07a9ef036e60 SHA-256: 266f32bf80caf9656e41ec8516cf7b803e9c9c4459ba3b7af57db9a357586313
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary external URL, 'https://dafemum.ru/wix?keyword=java+love+white+lake+ny', suggests a lure related to search engine optimization or phishing. ClamAV detection and ML classification further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=java+love+white+lake+ny
    • https://pudufanosi.weebly.com/uploads/1/3/4/3/134324904/1101180.pdf
    • https://ganafotereko.weebly.com/uploads/1/3/1/1/131164127/bumudid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fonibinaraj/jobojobimonemorozob.pdf
    • https://s3.amazonaws.com/dubiditiginowo/jojub.pdf
    • https://s3.amazonaws.com/zalisujezajaje/50542380072.pdf
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_81f1c7f8b3414f3fb587ab1d3c08cfc7.pdf?index=true
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_3a353e961c474c0eb6e9c8375a67f79d.pdf?index=true
    • https://s3.amazonaws.com/fedufiporara/jetatolitefubozizamidiv.pdf
    • https://s3.amazonaws.com/sojuravewi/xidit.pdf
    • https://s3.amazonaws.com/savukojubusum/pemorixe.pdf
    • https://s3.amazonaws.com/jiwotarotavuz/35945252132.pdf
    • https://s3.amazonaws.com/libosokune/20445487664.pdf
    • https://s3.amazonaws.com/fobupojowojon/html_coding_for_free_fire.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_6f2e76d7e6ca44e090bb5f7140f51060.pdf?index=true
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_466fdaa64536437c91518c922cca2bbe.pdf?index=true
    • https://s3.amazonaws.com/rujimidujek/decision_tree_sklearn_plot.pdf
    • https://s3.amazonaws.com/zizene/27684177040.pdf
    • https://s3.amazonaws.com/numegubowalonan/computer_science_for_competitive_exams.pdf
    • https://s3.amazonaws.com/zidosozawok/modern_essential_oils_handbook.pdf
    • https://s3.amazonaws.com/fomudebipefasu/juvotelexusasonaxajotawa.pdf
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_91949ed804b24cfcabd19dd9a8fe0fcb.pdf?index=true
    • https://s3.amazonaws.com/solonebosop/1918050604.pdf
    • https://s3.amazonaws.com/xijuxosisomuna/how_much_does_a_medical_laboratory_scientist_earn_in_australia.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf74.bin
a90689d99973ddafd5bbc73972b215dd4724224d661df31767d2e36e95fead8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF74 4804 bytes
font_01_sfnt_off0000dfe5.bin
d636e722133712767ef0265c7ab1ffcdf8a88256650ea6cb7c7cbc987f1f9d6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 10576 bytes

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