Malicious PDF — malware analysis report

Static analysis result for SHA-256 71679521ecbc7c03…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 10:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a33223dbb8b745c292155ab39f928975 SHA-1: f721aa850d8170e93d2ab6f23aa809e781477d8f SHA-256: 71679521ecbc7c0304a4bcccb83027698ecc2d95594c68825f68f7d63a0faa3c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to PDF files on potentially disposable domains, suggests a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kingsauto-bar.com/js/upload/files/23891560445.pdf In PDF document text
    • http://jeykrishnaclub.com/images/file/41149872649.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/82215167213.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/52522512183.pdfIn PDF document text
    • http://shesob.com/file/files/miboranazek.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/ziwuxasekud.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403cbfc2c4f---85944148090.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/sujabagaxesijujuvul.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/xidoxazadowefopifunem.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318e215bcea---9760899896.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/93093373369.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/nopojekoximuzuj.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/72090364812.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_235316_9165.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/kizoruzorumimibapajobus.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/regikiledotorojawisuk.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/67848984773.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/2982824642.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/rifaza.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/kapoxesolenotenezekulidam.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/ledud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+draw+a+capPDF 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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 10040 bytes
SHA-256: 052f5e3d3eab989d371f4f555de6169c877c2b1687dcfb7221607037a9ac9eed
font_01_sfnt_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F1 17216 bytes
SHA-256: 4c05ffa8b1441568ad1796e93e0012a263f57a96c9a45387c1ffdd194efca658

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