Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37d58a1ff49405c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-15 20:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c939169b462a40277338dad42b1dfddd SHA-1: 8e7e604cf2899ee89f34e3fd5c2f7cf4752c9948 SHA-256: d37d58a1ff49405c7e7a486dd246bb50f81a72c6b341cbad0af21c80885f165b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to distribute phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://smidgel.ru/uplcv?utm_term=infinity+quotes+love PDF link annotation
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/80995061566.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/kezusabi.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/24200781719.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb5b08b41---jilejerigeralo.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/93306930094.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/58633631701.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/58870479971.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/71181313506.pdfIn PDF document text
    • http://infunplastic.com/d/files/11357379626.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631508300.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/81628179143.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/10061523692.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/ruvezorutobesozigokaxuru.pdfIn PDF document text
    • http://baoveantam.org/upload/files/92953206111.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/vamifaloxegagamarewenif.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/bexukemiwelesotazoru.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/jobesalogekizo.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/61625717663.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/mafesisotawuloketu.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/77126476957.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/15119876674.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jikusexomir.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614099b2858cb---jirus.pdfIn PDF document text
    • 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_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 10320 bytes
SHA-256: 21d64a506a264601718dc62ec35fdc96eded4bc78ef3638edfd5c48d35324c14
font_02_sfnt_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 15796 bytes
SHA-256: cd1750a47a9ba9ee0af899c2f029c97c5d1115007ace5c0d73c4b3f0337cb668

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