Malicious PDF — malware analysis report

Static analysis result for SHA-256 68090f267355aacd…

MALICIOUS

PDF

80.5 KB Created: 2021-04-20 15:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 62b30d762e2e9c8e56bc984122c284aa SHA-1: b515101201194a62f5cea0c0bff4c042bc25c8ab SHA-256: 68090f267355aacd4c55b88d97d2c416b8a2c1d0d75a076fe890fe5bd3636e89
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to journal prompts, which is likely a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/strik?utm_term=drawing+a+day+journal+prompts PDF link annotation
    • https://rijepunekelawe.weebly.com/uploads/1/3/0/7/130739007/7414509.pdfIn PDF document text
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/5275970.pdfIn PDF document text
    • http://mowukedova.mypressonline.com/importance_of_central_limit_theorem.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/canada_provinces_and_capitals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_601915e44061c.pdfIn PDF document text
    • https://saxoxukodumixab.weebly.com/uploads/1/3/4/6/134635675/35102c0868.pdfIn PDF document text
    • https://futiwoku.weebly.com/uploads/1/3/5/9/135957929/nevojutovumo_papibe.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/wod_mage_the_awakening.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_6052ae61b2612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495262/normal_5ff0161bb7279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5fce981f1377e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_60400cadccac8.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/29773494602.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/40200662246.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/fagekumejubapu.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/mi_burrito_sabanero_sheet_music.pdfIn PDF document text
    • http://gozidonozali.myartsonline.com/phonetic_transcription_of_english_words.pdfIn PDF document text
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_17ab6338ea5141d69c814bc6efc80c37.pdf?index=trueIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/inland_aquaculture_engineering_fao.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_23203514c2804c939108a4dcc2f9dad9.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 5548 bytes
SHA-256: bca28880a8cb7979ac54ce999fd6f14ef1ccf2964ae7232c0af270ecc402aae6
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 2272 bytes
SHA-256: 0d97ea5d10c24237a518a8aa30ec22dac6fd95e0bd8ef0bf9fc604849c12f916
font_02_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 10924 bytes
SHA-256: bdbeac7279f751742148be3b555fe147557d8c103a4ea41cca3746b97cd48c65
font_03_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb