Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cf3f9175893b11…

MALICIOUS

PDF

92.9 KB Created: 2021-09-20 12:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb6b9789f116f9e84cef5861a8272efb SHA-1: 911b6a7041e9917244484c8527416e90ec086ac9 SHA-256: 86cf3f9175893b11534e9212d3fae925cf8cc1bdac58bf8ba42b9bf7e25842c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on domains that appear to be link farms or disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://grafconsulting.pl/Upload/file/wajidejoj.pdf In PDF document text
    • http://houstontca.org/Content/uploads/files/kegexuzibapepi.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/89332344595.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/tikixigolopir.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/42083828720.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/68107765202.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/sivozojutumewubudilavi.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/2173778705.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/jasalupexivuvurinafok.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/13930660440.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e298802f91---fomasodikesepe.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/5967672216.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/domenevuz.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/68863837895.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/kuwamajatabukupif.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/pejurotaxizazux.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/lomoxulopo.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/delaxiw.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/7559018305.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061206421122.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/70026288673.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/33383530023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+mesh+networkPDF 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_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 10464 bytes
SHA-256: d5891280b0ddca214f96a2ab7225c7363bb7d46cbadba3209c615ae8adc6cdbe
font_01_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B9 17868 bytes
SHA-256: b38ad531a185b8225ef8fc0c87a176b965aae7be6aa953690b3632e43b4df9eb

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