Malicious PDF — malware analysis report

Static analysis result for SHA-256 181f5e4d2f5e71fc…

MALICIOUS

PDF

99.0 KB Created: 2021-03-29 22:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0847393c28d36ae684d5f86e303c4c60 SHA-1: 29c1ba0ac769705b638eb57ba80864ac39fc9d26 SHA-256: 181f5e4d2f5e71fc77b3242301c14a1002be36352f8a173167a662f9a3d9adb1
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many URLs pointing to other PDF documents, suggesting a SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=membrane+transport+mechanisms+pdf
    • http://xarapover.mygamesonline.org/34814981167.pdf
    • http://xazixovabifin.medianewsonline.com/structure_of_immunoglobulins.pdf
    • https://cdn-cms.f-static.net/uploads/4369185/normal_60208d480bd22.pdf
    • https://static.s123-cdn-static.com/uploads/4403408/normal_6004f7c616dd1.pdf
    • https://cdn-cms.f-static.net/uploads/4459917/normal_6017b9718590d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuvugagud.epizy.com/pomatiridi.pdf
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_a0897aeeb07c4bcca2b3de7740e668a1.pdf?index=true
    • http://jatoxat.atwebpages.com/dental_material_phillips.pdf
    • http://jemukiguwuw.myartsonline.com/numerologia_tantrica_significado_de_los_numeros.pdf
    • http://zukusuvajijip.epizy.com/explain_the_three_main_differences_between_dna_and_rna.pdf
    • http://walefofu.rf.gd/cambridge_english_advanced_2015_answers.pdf
    • https://s3.amazonaws.com/makixibawumebol/unreal_engine_android_game_list.pdf
    • https://s3.amazonaws.com/sazariwapa/embed_adobe_air_in_android_app.pdf
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_c775b9137ae647049de79e5949303a02.pdf?index=true
    • https://s3.amazonaws.com/tobovunoberiki/data_scientist_salary_in_india_for_freshers.pdf
    • https://s3.amazonaws.com/setikizo/define_lateral_thinking_in_simple_words.pdf
    • http://nevafofuvabovid.atwebpages.com/viziginenisukowezorip.pdf
    • https://s3.amazonaws.com/tigovatolis/renewable_energy_worksheet.pdf
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_cc76ba8fbd974476b8755cfe77b6eda8.pdf?index=true
    • https://s3.amazonaws.com/nalifij/45836535152.pdf
    • https://s3.amazonaws.com/fadupazageraf/nojizeziparizabukugi.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/39071826291.pdf
    • https://s3.amazonaws.com/gotenukevepunin/63173645459.pdf
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_77984ef2e4f84cbc90ebf8b0b65c12af.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cfd.bin
7309c7c909d280231fc5cd58dad32c13d71a807df5ba6ab2d31355f94dec3aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFD 5508 bytes
font_01_sfnt_off00013f86.bin
7284b6d236930c8f8637d661a77e4a625362819a1d894dae52895932018827e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F86 11888 bytes
font_02_sfnt_off00016732.bin
61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16732 16096 bytes

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