Malicious PDF — malware analysis report

Static analysis result for SHA-256 7082a6aa720c3c78…

MALICIOUS

PDF

69.0 KB Created: 2021-04-03 01:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38418d0c72ce753c208fa6b59dccec8f SHA-1: f1e300cd87c2a1a84350c513203898a256e2007a SHA-256: 7082a6aa720c3c789e2bd9482e15504f8f1d3271ad5b868f89f1469e65aaa0bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs likely serve as a mechanism to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack vector.

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=mixed+ionic+covalent+and+acid+compound+naming+and+formula+writing+worksheet+answers
    • http://peluxuba.sportsontheweb.net/strategic_thinking_exercises.pdf
    • https://duwaxitim.weebly.com/uploads/1/3/4/3/134312722/kibafa_vamudezozike_govunowij.pdf
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/disekosifebati.pdf
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/xovodim.pdf
    • http://damewumesigalut.medianewsonline.com/bailey_and_love_s_textbook_of_surgery.pdf
    • https://dopapixe.weebly.com/uploads/1/3/1/3/131383645/d237da.pdf
    • https://sedemosifov.weebly.com/uploads/1/3/0/8/130874126/1926850.pdf
    • https://zogiwabut.weebly.com/uploads/1/3/4/3/134364715/makomukuwatoguzakuf.pdf
    • https://detifurotuso.weebly.com/uploads/1/3/5/3/135321595/saxagaxekusufoniz.pdf
    • https://kigusokitog.weebly.com/uploads/1/3/5/3/135300221/ae80ad237.pdf
    • http://lafilubepojev.scienceontheweb.net/97659290697.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/60e1b125-50a8-4808-81bc-12f23eb43c80/why_has_my_electric_heater_stopped_working.pdf
    • https://uploads.strikinglycdn.com/files/7491a7b0-c1da-4edd-a5bd-cd874fe9edd4/98518693588.pdf
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_a0187eb8640d4388b077ef5f7e8c3a25.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1173cc7-6251-4ece-8c55-02307ee9fb62/60416438911.pdf
    • https://uploads.strikinglycdn.com/files/94b1ddae-2e95-40e2-80b1-a57c5389f68c/kudar.pdf
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_0aaf9a32f7e44214913344e7a2d812aa.pdf?index=true
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_dca0e9e19dbf40e49a2f50b5dd9a2021.pdf?index=true
    • https://uploads.strikinglycdn.com/files/64c94023-9f44-4deb-aa2f-e0ab071d7f39/kezuvi.pdf
    • https://s3.amazonaws.com/tirimofufemukat/stock_market_bubble_crash_2021.pdf
    • https://s3.amazonaws.com/pivetuzadujo/pto_treasurer_report_template.pdf
    • https://s3.amazonaws.com/girilifawuxi/74438001224.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_off0000cf68.bin
f31c62bdfcd762d0a24ba66e402fdc425362d23c7a614772620b9259f25bc1b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 5856 bytes
font_01_sfnt_off0000e357.bin
b406e2d2dfcad8f1f0267fb30998d249bb11be63cc680162cdb61056d2e90867		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 9848 bytes

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