Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33f6595a108210a…

MALICIOUS

PDF

82.1 KB Created: 2021-03-20 12:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f64fd77e6a3379a3b395d59f938f45cb SHA-1: b89b5577bb11b280355572db88445c5709caa2e2 SHA-256: b33f6595a108210ac684363bd97c71bf780e0c2b676b5e9963db3f76a29fe83a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrustworthy hosting. No scripts were extracted, but the overall structure points to a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://bologen.ru/strik?utm_term=normal+snacks+that+are+gluten+free
    • http://idealica-italiauficiale.website/jopefasunalaxojakonawm5s53.pdf
    • https://gawinageriju.weebly.com/uploads/1/3/0/8/130874076/2bdc7c84d89ba8.pdf
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/2142187.pdf
    • https://cdn.sqhk.co/ganuniwiku/hhwhjMC/color_switch_classic_level_80.pdf
    • http://getyourscore.info/zarasififajeso2zfjv.pdf
    • http://znasila.ru/rovewerumewijalojagipebepzikqy.pdf
    • http://lngcliente.com/asset_management_investment_guidelinesgrba6.pdf
    • https://givepatodanino.weebly.com/uploads/1/3/6/0/136097232/bunididozawerolamof.pdf
    • https://cdn.sqhk.co/lajawawinu/CYieRjb/segowikubonu.pdf
    • https://fegoparowewara.weebly.com/uploads/1/3/4/3/134321013/1fdbc745f9f1a1.pdf
    • http://wopivobozas.66ghz.com/sevufawepivevokib.pdf
    • http://nilanudid.iblogger.org/komezitiral.pdf
    • http://lnstagram-copyright-confirms.com/homogeneous_poisson_process_examplemozfw.pdf
    • http://topplafond.xyz/janamaterigutirekumiso5bfzb.pdf
    • http://itverys.space/nifoguwezamakixa1d.pdf
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://walaratetev.epizy.com/vonamivuxojexarakupujom.pdf
    • http://rofeluw.epizy.com/lgs_additionsverfahren.pdf
    • http://linopiziv.epizy.com/auditoria_informatica_ejemplo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e231.bin
6a031bbba9ecfc47d11c503b24d7e2ad9266fe0affde6d3889f15656ca5d5a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 5164 bytes
font_01_sfnt_off0000f398.bin
16f6b62ac2dc72301795812ea474b9ae225d47eedaba9f584731b479e1e878f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 10276 bytes
font_02_sfnt_off000116f2.bin
06f9f397a3e63dc2a08781e6271279b584ca2d8359dcb8d7a8783b1e0dfc5e25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 16416 bytes
font_03_sfnt_off00012caa.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAA 4324 bytes

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