Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c678001185e5ac4…

MALICIOUS

PDF

77.0 KB Created: 2021-05-06 23:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b44bd23345b453553efb9f680987f873 SHA-1: 1c9459cae8b6ca9666f7b908bfc5ce5a46e7343b SHA-256: 9c678001185e5ac47c8e26fc52b544f41e4959d06259248f51a102a073dc361d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm for SEO manipulation or phishing. One prominent URL, 'https://kuzutuzo.ru/strik?utm_term=5+love+languages+of+apology+pdf', is directly embedded and likely leads to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=5+love+languages+of+apology+pdf
    • http://usacreditreport.info/65169218864n91ft.pdf
    • http://gevazuvunurodum.22web.org/pathology_mnemonics_free_download.pdf
    • http://jowawebiru.22web.org/klasifikasi_anemia_hemolitik.pdf
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/gugugiwaketim.pdf
    • https://zekuwatifakaxi.weebly.com/uploads/1/3/2/8/132815855/nufujadimug.pdf
    • https://vimanofadubob.weebly.com/uploads/1/3/5/3/135304206/3147324.pdf
    • https://pizotiwedif.weebly.com/uploads/1/3/4/8/134868845/04a05.pdf
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/3481809.pdf
    • http://busforpay.online/can_i_audible_books_to_usbd01cw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dogazisuze/18784052832.pdf
    • https://s3.amazonaws.com/sevoga/kibupakibidagupig.pdf
    • http://nodafawujanego.rf.gd/xesupajusavapazodasobapoz.pdf
    • https://s3.amazonaws.com/kudufigunabi/como_hacer_un_inversor_de_voltaje_de_12v_a_220v.pdf
    • https://f516a5e5-1936-4b34-b436-a929b3a34b8d.filesusr.com/ugd/774001_787f6355ed4e4fcc82886335971bbf34.pdf?index=true
    • https://s3.amazonaws.com/kiwopusafize/game_blackjack_21_mod.pdf
    • https://s3.amazonaws.com/fojaxexino/15634314411.pdf
    • http://rajusesozawan.rf.gd/volvo_xc90_owners_manual_uk.pdf
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_c48205b38841402eb720c7f666f147cd.pdf?index=true
    • https://s3.amazonaws.com/tujeviwakirawu/46007199729.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_off0000ee91.bin
1369d183381d21377bd5060c588db9712991c0bc495ef4ef9af8c63afc8b860d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 5304 bytes
font_01_sfnt_off000100c6.bin
bc82376817a7c40e38fc6399585ec254120b1254e8b8e66362c8beddc3ed3fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 10808 bytes

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