Malicious PDF — malware analysis report

Static analysis result for SHA-256 de79e7d3c7b98068…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 12:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84ed69075e41be42c0f26c978a0a7b0b SHA-1: 9f9f9515b6e1b6798d9152ec453c3d9bccb4b7f7 SHA-256: de79e7d3c7b98068d69b15631318fb596ea9134e10159f66041c6b1cb7823c5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous external URIs, including one that appears to be a redirector with a UTM term, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=clash+of+clans+mod+qpk PDF link annotation
    • http://greenvisioninternational.gm/userfiles/file/medap.pdfIn PDF document text
    • https://remini.hu/userfiles/file/nelenekuf.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109121111215016.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/fukunuzifugepugemof.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///gafupavodogop.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/99658042458.pdfIn PDF document text
    • https://scalper.ir/data/files/file/dewufupomojupamolusaka.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/31770861570.pdfIn PDF document text
    • https://zzhqhi.com/d/files/37442404796.pdfIn PDF document text
    • http://kvrhousing.com/uploads/23771281339.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/zuwoxi.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/47810272413.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/10909534039.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/49973285412.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/22249189939.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/53510394995.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/petedekupirosofego.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/kamitufuremikupozi.pdfIn PDF document text
    • http://sieuthibds.net/images/files/62501132719.pdfIn PDF document text
    • http://sh-ether.com/uploadfiles/files/kapisafazupitepu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/19s1ufbu795vm05u8emisi0f3u/65348152925.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83977315534.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/pubemijasepekokolobuza.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210916044658625.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_off0000b16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16D 10732 bytes
SHA-256: 8f6b3ac790539ca02a519ff2667916c4231b98626dee9d3317f32b16b1d9bc58
font_01_sfnt_off0000c9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 14740 bytes
SHA-256: 3488fb806a2bb61df7fbc84b69b2237eb7384dbf1119a80743af35166f682463

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