Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d169a1718913b2…

MALICIOUS

PDF

74.9 KB Created: 2021-03-28 07:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59f289cf26d2830644d8c6ba32e5c2c4 SHA-1: 225133165801a676f211f7f118ea4723059ba4f2 SHA-256: 94d169a1718913b279296b876ad2a0a912042e47490fa02afb531e5f577777bd
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a potential lure for an 'answer key'. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent to redirect users to malicious sites or download further payloads. No scripts were extracted, but the overall structure and heuristics point towards a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/award?keyword=intermediate+market+leader+3rd+edition+answer+key+pdf
    • http://vuzuwul.getenjoyment.net/tuwikot.pdf
    • https://cdn.sqhk.co/boxewemutox/yygc3ji/wood_platform_bed_frame_queen_diy.pdf
    • http://rekijiwowak.scienceontheweb.net/adsorption_and_absorption.pdf
    • http://lupazul.mywebcommunity.org/built_to_last_successful_habits_of_visionary_companies_free.pdf
    • https://kigodebilak.weebly.com/uploads/1/3/5/2/135297846/2288339.pdf
    • https://cdn.sqhk.co/taxuvoguraji/PxAgiii/madumasere.pdf
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/d27e6d5b.pdf
    • http://zukoretevir.medianewsonline.com/sulovigenimijanavixogeg.pdf
    • http://weridif.medianewsonline.com/96421097122.pdf
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/ca0dd5f51ed05ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_697e946f9198489394d23f659bbd816d.pdf?index=true
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_03c7498292d5426f8ad012c4f12f0207.pdf?index=true
    • https://s3.amazonaws.com/xasovewipeje/81020173543.pdf
    • https://s3.amazonaws.com/zarelusipofox/14815839602.pdf
    • http://kifesafijupesob.onlinewebshop.net/risk_assessment_report_template.pdf
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_bcb8a9f5afe44586b845d905b21a1fcc.pdf?index=true
    • https://s3.amazonaws.com/rawesaragegugar/tenopalinogubepinevewogo.pdf
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_aa882cebb8084ad29f1b0728a67b07d7.pdf?index=true
    • https://s3.amazonaws.com/vuraradaso/11736641454.pdf
    • https://s3.amazonaws.com/jiwisigetizoxif/83847016887.pdf
    • http://girofili.myartsonline.com/3553081371.pdf
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_be94f62124f04a57a15a7636eb8d1f9c.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e17a.bin
a1dea5686e772eda2a792060b44f75ffd579cdca8b7bbd06cf08ec56fac18ba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 5548 bytes
font_01_sfnt_off0000f45f.bin
29603cdfbda0453b2a456c8ef131f1cda52080126a3aa480aa4acf89752c1582		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 13528 bytes

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