Malicious PDF — malware analysis report

Static analysis result for SHA-256 507483d05a891822…

MALICIOUS

PDF

81.1 KB Created: 2021-04-03 15:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e57828c3f198a48d74028338e7bf52cd SHA-1: ee83ef8c8cc2b05ea69f5e771fbc1449fef9f1f9 SHA-256: 507483d05a891822356cbf95ecb18c0cad2e01042af3fd9731a307a10a836455
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs and the document body, despite being heavily obfuscated, point towards a lure related to 'Beginner crossfit workouts no equipment' to encourage users to click on malicious links. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pelibifir.ru/aws?utm_term=beginner+crossfit+workouts+no+equipment
    • http://xorelurisadadun.iblogger.org/94679184733.pdf
    • https://cdn.sqhk.co/bisegepamitu/egehghc/ftd_disease_progression.pdf
    • https://cdn.sqhk.co/vulasobifow/gd4KibU/86841573137.pdf
    • http://rorezorejadij.iblogger.org/76414107391.pdf
    • https://cdn.sqhk.co/pixorikibam/jfSihX3/panavizisekefapewuwetafup.pdf
    • https://cdn.sqhk.co/rovujesox/daFvrgj/battle_chasers_nightwar_switch_characters.pdf
    • https://cdn.sqhk.co/dixazotunu/hbjbjib/caddis_fly_identification_guide_uk.pdf
    • https://cdn.sqhk.co/fiseguvugele/hfngwhd/pusewu.pdf
    • https://cdn.sqhk.co/resozasevej/TChhM3i/76488054711.pdf
    • https://cdn.sqhk.co/poxosafixe/idZhjhj/77629019596.pdf
    • https://cdn.sqhk.co/zewezerezi/dvRiejf/89236963578.pdf
    • https://cdn.sqhk.co/waxobakal/HYrheje/73928541078.pdf
    • http://maroxelil.22web.org/nitidogigomuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zovagupegi.rf.gd/how_to_check_codes_on_2019_harley.pdf
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_c07d2e48464d4fc0bcec35f8bedf6020.pdf?index=true
    • https://s3.amazonaws.com/dupula/distress_tolerance_activities.pdf
    • https://s3.amazonaws.com/dumupa/nuroziwopiroja.pdf
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_1106786c3a05499d990437ab4165e13a.pdf?index=true
    • https://s3.amazonaws.com/paxivogedewilu/charged_particle_in_a_uniform_magnetic_field.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/suponafud.pdf
    • http://lejemerane.epizy.com/kopubibisiwarob.pdf
    • http://badiwofotafazol.epizy.com/64785114877.pdf
    • http://ponowepu.rf.gd/rizimifep.pdf
    • https://s3.amazonaws.com/jixeremipet/xevitorusawowalamibamo.pdf
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_e4039384e3e3420d9b9d9bd3271628f7.pdf?index=true
    • http://pamapezule.rf.gd/best_free_html_admin_template.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_off0000fdea.bin
ed89306c4305f36f7c0b8166ddcd2184e7173b7010a13dd043a6918c5d7b069b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 5424 bytes
font_01_sfnt_off00011073.bin
38f92477fd5ed0b1ee952c6a084d73cc5f44241bf9f32df56f31eea3901005e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 10648 bytes

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