Malicious PDF — malware analysis report

Static analysis result for SHA-256 523df0e1bc03d626…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 11:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4560314058238cc69914e4e98b652e31 SHA-1: 7130e9c2b46e3506d2276856b8176c0c0e69be93 SHA-256: 523df0e1bc03d626d7acfefeda54011215854366de502e45facf2ddc10ee7e0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are structured as a link farm. This is characteristic of phishing or malware distribution campaigns. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://anitt.in/ckfinder/userfiles/files/88265268900.pdf In PDF document text
    • http://unseenadventure.com/userfiles/file/kosezopubozivifadogevizab.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/zenuwozefa.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/28043970186.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/88720817845.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/89572619687.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/57250180109.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/85494952869.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/80274022434.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/68934325911.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/56627071666.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/17149643835.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/labux.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630881880nUKw.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/maxokudi.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/konege.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135883c43f46---51961932556.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/xalulesegixajefe.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84229848652.pdfIn PDF document text
    • https://digireg.lu/upload/kixepolipumixajava.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/bogotivini.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/90454901993.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/42907961101.pdfIn PDF document text
    • http://kaies.net/upfiles/210909051356426646w6mf1g.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/donemaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+grudge+2020+123moviesPDF 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_off0000b7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DE 18396 bytes
SHA-256: cbcd569a051dd777c270ca1b28656783ba4bfe57a00f5b5599796b0e74060a67
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 10880 bytes
SHA-256: 355c138092dd18f6d459df0c1a808cef781afad63b8274332aa588c153867554

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