Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5cb9ddec65ef7e…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 04:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a11d5ed2950a235f21b2f78e909dd468 SHA-1: 62ed7d427b6274ad70bd77322ee198039d6b3f24 SHA-256: 8a5cb9ddec65ef7ef6cb36152626fed970f6dbea43443b40eff036877aaaa7fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly indicate malicious intent. The primary goal appears to be directing users to external malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://associatedreclaimed.reclaimedoils.com/userfiles/files/44600239276.pdf In PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/61026547804.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/fivej.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/27607195141.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/laxujelajogavu.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/gegisiguwajoxefobosuwezi.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/fokokivojotobodib.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/galer.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/wixado.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/259371eb1abfafe48c612b4f1c8755ff/32003691751.pdfIn PDF document text
    • http://theponghop.com/upload/files/46257616487.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/54839835843.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/tifopukoxa.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/55476362855.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/nagumuxera.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/witomadunodere.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/mefotez.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/10142069632.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/65278408738.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/jimafekilabujuvonofijige.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/84237621123.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/warizutaf.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/14787600237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+lost+ways+2+pdf+downloadPDF 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_off0000b242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA54 17912 bytes
SHA-256: 2f4499d142c145cdd9952871afd36b681621c9c757feaad730c9d2cf2f7a43c9
font_02_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 10684 bytes
SHA-256: 3fbf10161b284912f44c796dd5c78b0bcf9cad7100cdea667dd2726c7b96bcbd

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