Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d0652f6ac2d6ba…

MALICIOUS

PDF

84.2 KB Created: 2021-10-05 02:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e8a210570fac91bfd0d3dc999e73051 SHA-1: e3b4306004a375b61d4d97805c583de207110a53 SHA-256: c5d0652f6ac2d6bac264669916539c42ad48ee502aa2c76d7f90efa7f37bd282
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs hosted on various domains, with a high heuristic score indicating it functions as a link farm. One specific URL, http://huarui-bio.com/upload/files/60418377764.pdf, is flagged as potentially malicious. ClamAV also detected this file as Pdf.Phishing.Trojan, reinforcing the malicious intent. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://huarui-bio.com/upload/files/60418377764.pdf In PDF document text
    • https://shunnasato.com/68915132070.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f421b9eda9---77081971057.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/wujexumugosobapese.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/97443072733.pdfIn PDF document text
    • http://360global.ca/userfiles/file/migilokibapel.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/83348685414.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/81329938849.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/wagasozaxudegono.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/benenodowudirarizedekufag.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/93400549764.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/28423977029.pdfIn PDF document text
    • http://abnicum.ru/files/file/nukudax.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/80325658763.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210903_F6690F5063DB6322.pdfIn PDF document text
    • https://signika.pl/Upload/file/62891285219.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/9874857986.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/defavereloxejigip.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/48136687835.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/gudexemuzimas.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/vedaguwigazurij.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vezurevog.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/50208134019.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/uo3dt94vu3k27b7lmob777lolk/wutoruro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chemistry+unit+7+review+answersPDF link annotation
    • 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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 21428 bytes
SHA-256: dc33edf4139fd8fba496152534a8552a60478cbf3c4b849ae2743e26de874df8
font_02_sfnt_off00012aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACA 10652 bytes
SHA-256: dcfa016d44f5e9534f5e8960092bd0787777b0a7be19d5dc5079ce48fc3f9559

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