Malicious PDF — malware analysis report

Static analysis result for SHA-256 e636a09a728aeb25…

MALICIOUS

PDF

79.8 KB Created: 2021-03-10 03:34:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49f8a4384f8d2b8ea1c0f0cdba327ab7 SHA-1: 5551d2a0bf5ea15d7e7d1b8629061cca13c36574 SHA-256: e636a09a728aeb2549a47376fe10db7173372622841a516c5faadfea2421429f
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to a suspicious S3 bucket URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://golowaki.ru/123?utm_term=online+newsletter+templates+for+teachers
    • http://dkmz1.club/good_websites_for_musicimqdu.pdf
    • http://vitrinachel.ru/memory_jogger_worksheeto3mot.pdf
    • http://pro-komp-master.website/vexotuburesua9nle.pdf
    • https://uploads.strik
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wemazun/vunetuwarunofegorat.pdf
    • https://s3.amazonaws.com/bajapovogam/3855607778.pdf
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_82483ae494e04540b5411a8c96b2e317.pdf?index=true
    • https://s3.amazonaws.com/kokesatodixon/application_form_for_uk_visa_from_spain.pdf
    • https://s3.amazonaws.com/vufupu/indesign_magazine_layout_tutorial.pdf
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_24f21f9e21164e9cb77bd790e94cb6de.pdf?index=true
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_9c502618e2c64235b9ff6b6649ece15f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e743823d-b423-4865-adc9-6830b6c2f2a5/how_to_use_curl_activator_gel_on_natural_hair.pdf
    • https://uploads.strikinglycdn.com/files/90f5d3ef-6b86-464a-b50c-54b17b80dcae/kareje.pdf
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_a3333f84f64141698911b6f1d3cedf1a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8718cfb-a3cd-4ad1-9979-3df19cc0f058/69774194127.pdf
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_8fa2798f191c4c4eaa657e1606d1b858.pdf?index=true
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_ad85b5cc605b448db7c9907007e68a08.pdf?index=true
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_ec052db8945745108b1ca793818e9c60.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0bc61b1f-950c-43ce-b747-2db9f1df42ea/what_is_the_weight_of_diesel_fuel_per_litre.pdf
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_c1522c4d031d4ece9e7603f793e21491.pdf?index=true
    • https://s3.amazonaws.com/difigomisosak/47935772871.pdf
    • https://uploads.strikinglycdn.com/files/5c88fa91-8933-40c8-a274-d7d7d29cedbc/44870030461.pdf
    • https://s3.amazonaws.com/bulolimepol/canvas_powerpoint_template_free.pdf
    • https://s3.amazonaws.com/xukonakefules/harry_potter_book_set_amazon_india.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_off0000fb05.bin
b5cb48d08768701cd7468c34ebf63078a4d7a3cfef9f0aa44e50e8ccc7059069		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 5376 bytes
font_01_sfnt_off00010d30.bin
f9516db75775d4e20f8c70653bf3ac628ae152c61a8efd4dec47ae99e9e30f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 10732 bytes

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