Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09c8fea44749204…

MALICIOUS

PDF

80.4 KB Created: 2021-04-16 02:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fab74ff28af4ecd9cc6aba70f163ea03 SHA-1: 9df67db03387b5d294e0c81d6365a49ae24596f1 SHA-256: b09c8fea44749204ff573846286f9403baff14a19b53f3416690e74aadcdef4d
104 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains an embedded URI pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to urgency, further supporting a phishing or social engineering attack. No scripts were extracted, but the PDF structure and external links suggest it's designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=porsche+boxster+owners+club+uk
    • https://cdn.sqhk.co/fololekumi/jijcii5/sulepideterepakozagewine.pdf
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/6cfddf1dd6.pdf
    • https://cdn.sqhk.co/jukusenefow/zicidjb/15988604948.pdf
    • http://kvrovk.xyz/evanescence_fallen_album_zipwxsza.pdf
    • https://zanonolupurezo.weebly.com/uploads/1/3/3/9/133997165/5285323.pdf
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/ccba0e480f69.pdf
    • https://metesanej.weebly.com/uploads/1/3/1/8/131858044/vuzinit.pdf
    • http://rigalanolupibe.22web.org/vowusovozejisobeparo.pdf
    • http://modozadubop.mywebcommunity.org/73876259902.pdf
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/5158359.pdf
    • https://cdn.sqhk.co/makulowujip/jOejbOp/43344085774.pdf
    • http://copyright-help-report.com/workout_jump_rope_near_memqdxa.pdf
    • https://cdn.sqhk.co/nepasibuta/tje14pk/konasunebefewudunowib.pdf
    • http://xizapataruxeku.mygamesonline.org/11099895259.pdf
    • http://samejeno.iblogger.org/jepojemepidusape.pdf
    • http://nemugub.mywebcommunity.org/bevagasamakafe.pdf
    • http://nuveclovet.xyz/is_google_adwords_certification_hardrksyn.pdf
    • https://pukovapu.weebly.com/uploads/1/3/1/3/131379149/wokav.pdf
    • https://cdn.sqhk.co/nopawuwam/jhup4jc/81742606917.pdf
    • https://zijolafazul.weebly.com/uploads/1/3/0/8/130873795/wulivudad_batorex_gazezefixunijis.pdf
    • http://afracheat9.xyz/pufezotulelolexobzloz3.pdf
    • https://zonidazoledod.weebly.com/uploads/1/3/1/0/131070441/2142171be1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xesijapapun.rf.gd/sukixif.pdf
    • http://tudozujuxijoz.rf.gd/diwexosaranonixo.pdf
    • http://magelul.epizy.com/zomibazepesovuwalitu.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_off0000fa55.bin
7caa1f9402a66a494c702b12a444dd362d0754fd0c23640677ac7ee1f8368bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 5040 bytes
font_01_sfnt_off00010b8f.bin
b1b531972b79f0eb65299fa2af4f98704107430dba6ae043a839daa805a00e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 11176 bytes

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