Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe306ca5c3f86bb9…

MALICIOUS

PDF

95.6 KB Created: 2021-03-29 17:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87f128f3993ca1645e93a38a33e16418 SHA-1: ae61f38e9c45271374c0bcd356d2fc47c8695bca SHA-256: fe306ca5c3f86bb9829f8e3573204998f6ed09b8d5548c5c94b36cd8417a9f94
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious sites. The primary external URI points to a URL that includes 'free pdf' in its keyword, indicating a lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wix?keyword=gateways+to+art+3rd+edition+free+pdf
    • https://sesemuxedewa.weebly.com/uploads/1/3/4/0/134017121/neketepokisin-fejaduj-vodovozoditebeb-nijomolu.pdf
    • http://vomimaforotagi.mywebcommunity.org/what_is_the_significance_of_the_supreme_court_decision_in_marbury_v._madison.pdf
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/d0da12f183.pdf
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/b555214048e51.pdf
    • http://jijegak.22web.org/guild_wars_2_ascended_cooking_guide.pdf
    • https://wobanavemo.weebly.com/uploads/1/3/4/0/134096337/7092adaf8.pdf
    • https://gogunijex.weebly.com/uploads/1/3/4/6/134679659/f38ac5c7c.pdf
    • http://simenomevaxi.iblogger.org/how_to_have_good_time_management_at_work.pdf
    • https://baxolelal.weebly.com/uploads/1/3/4/6/134625426/mirawevosamutoj.pdf
    • https://vidasukesidi.weebly.com/uploads/1/3/4/7/134731400/vanalilovob-ruxag-junazasaf.pdf
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/sosapajipila-naterizanal-fixaxovufezil-serilomij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bezutu/71416339693.pdf
    • http://nejesezape.myartsonline.com/how_to_reset_bluetooth_earbuds.pdf
    • http://salevena.rf.gd/cellules_dendritiques.pdf
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_b178189004d34251b14a959e312b540f.pdf?index=true
    • https://s3.amazonaws.com/sajatofubote/canada_invitation_letter_template.pdf
    • https://s3.amazonaws.com/wetowuzuxit/cigarette_box_design_template.pdf
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_6be98f4554b243d290e051a1dd6a96ff.pdf?index=true
    • https://s3.amazonaws.com/dudujopixejikug/kulfi_kumar_bajewala_betiya_song_ringtone.pdf
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_b89607138edc4ac8a6666f95693f6bcf.pdf?index=true
    • http://xubedoper.epizy.com/89493112969.pdf
    • http://romukebiguvux.rf.gd/nba_basketball_score_sheet.pdf
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_fe927696c5dd44fcbeea3744f33d1722.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_off0001361b.bin
1f795eb68ed1adfb2600677077ce4d02108ee67cc23a67324e9cd1fb9a0c163c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 5392 bytes
font_01_sfnt_off000148a2.bin
7b960554091da2a77b2bca836de704b41e07c114c90fdf05f77c61cbb162bd56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148A2 11856 bytes

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