Malicious PDF — malware analysis report

Static analysis result for SHA-256 755914471a3e57fc…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 00:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99ba77756a9b664261f43c30ffd08ccd SHA-1: abb48378a11746ff983f3cc364a33b510d922233 SHA-256: 755914471a3e57fc58fa9f5a33ce57ee4334a3d7cb2ff3b66c765a8feda5a676
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the PDF's structure as a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=real+life+simulation+games+for+android PDF link annotation
    • http://kingalbertltd.com/uploadedfiles/file/vikizoz.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/vuvebanutorinugezadekat.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/xaranagewimutunar.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/midadapifugix.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/gopivok.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/79576805070.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/piwojalasexaminurabad.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/daziwadalanebojot.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/fb1236f086826dc849545cb0e146a8aa/zanodi.pdfIn PDF document text
    • http://szm.hu/userfiles/file/fanogo.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/31104993783.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/51670781837.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/bifaturutugosevezi.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/68036271205.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kefejuwogotag.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/46124660767.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/35743118843.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/fabojakojometiwin.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/nirabexogimo.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/vifarowusitarulax.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/76853228437.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/zavozaxumonotegesonugi.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/54660080489.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/11246243975.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 16880 bytes
SHA-256: 54380666d56968648d94a1f7f654e5d86f52b6d709b617767f61deec5d18d19b
font_02_sfnt_off0001266f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 10840 bytes
SHA-256: 059745ed0535450cfe2a4f84219346c54c1b552cbcc38430c2e32d39ebbedfd8

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