Malicious PDF — malware analysis report

Static analysis result for SHA-256 405e9a17dd3ebc47…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 03:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1e6ba5d921c39b2ad1a7eef8ade382b4 SHA-1: 83a3280ca71369cb0a712e544f93561bd47dd3a1 SHA-256: 405e9a17dd3ebc47e4d2fcf1a2b0d4277dd05bac8dce7adf14ad2fb5e650bfc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely involving redirecting the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://clap-bas.com/userfiles/file/90122994625.pdf In PDF document text
    • https://agape4u.org/userfiles/file/saxigusugemit.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/tinigifetiz.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75013471165.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/bivemanetebazufe.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/72393085057.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/kifodazixijizidev.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/goxamamuwukivabem.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161387a8c4d75c---68962862692.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/80953750306.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/13388424583.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/41987192455.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/xiloxalonopemoni.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e0be24c4dc881726d738dc58a056def9/35557434760.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/waris.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/27080294290.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/39161720241.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/mesabukefadafewi.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/nogopak.pdfIn PDF document text
    • http://gibisch.info/files/files/wabavasogumubonolixi.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/xiraretekubevigip.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/6968240828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=router+network+layerPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/66809295618.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_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 18656 bytes
SHA-256: a731097433ef05d98fd4b87f7b9aeda9ee2d4cd8cce478b3095267f262e16a04
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 10280 bytes
SHA-256: 3668adeba9f9a0c6ff389c99ef1bc8890348c212018135cc57f64e6a6b1115cf

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