Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b36d363b991552…

MALICIOUS

PDF

83.0 KB Created: 2021-04-08 09:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c0a7edb39d059bc7412a5d00890f44e SHA-1: 7c73fd92f0fcf494952ea7fd76f017beeb4459e3 SHA-256: 90b36d363b99155270dad22538408578c60715f9b14d7b006792a08820787fed
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating a link farm with numerous external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary external URI points to a URL associated with 'pubg free uc link', indicating a lure for popular online game players. While no scripts were extracted, the PDF structure and external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=pubg+free+uc+link
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/1499586.pdf
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/627ba79.pdf
    • http://wordsideget.top/constitution_day_worksheets_3rd_gradeglpo3.pdf
    • http://flowerport.shop/toastmasters_competent_leadership_manual_downloadncr6z.pdf
    • http://digtalcaliper09.xyz/samsung_un32eh5300_manualtqefe.pdf
    • https://zifekibovaliw.weebly.com/uploads/1/3/1/8/131871714/1044513.pdf
    • http://xededazofofiliv.iblogger.org/que_relacion_hay_entre_materia_y_energia_en_la_nutricion_celular.pdf
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/kuwinimogevif.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://romeital.space/2010_lexus_rx_350_bumper_cost93zuh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_5f16a87d9c574d8c97981609924b4589.pdf?index=true
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_9519860e3ad0484697b518e8e9033b7e.pdf?index=true
    • http://mifamin.epizy.com/mixojudonezapa.pdf
    • http://damusoborubumo.epizy.com/thyristor_family.pdf
    • https://uploads.strikinglycdn.com/files/4a86673b-841b-469d-a935-a72b2a1eda99/dosuwazarizoxeti.pdf
    • http://tegewixu.epizy.com/bounce_bike_app_apk.pdf
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_038eac1aae5140a0be7e7d7b3b89831c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4baf3b2e-0cf8-470a-9fc4-4d98c244ec2c/zuvafovagewafiwez.pdf
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_49d17ef6ca314aa981cd0f83b9cea50d.pdf?index=true
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_e54d40288f98405dab2e8ad0b60e3ac2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8fccbab3-e07c-4c89-860e-e943437fd19e/hp_laserjet_100_colour_mfp_m175nw_imaging_drum.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
    • 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_off0000f203.bin
bc022c7483c24224900f21a1cd6892d65713ee9f89d3cbeea122e6548151e104		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 4864 bytes
font_01_sfnt_off000102b3.bin
b1df58eab19a225b59901cbaa6ec2e9b232d4f2fe41b0fa3ceae628c7b6751ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 10832 bytes
font_02_sfnt_off000127dd.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 16164 bytes

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