Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9e668d89efdc81…

MALICIOUS

PDF

73.3 KB Created: 2021-09-26 06:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bd258970748f266abcd26fc741f45360 SHA-1: 6b90187ba03791888b7f495651457b4e2514b9e9 SHA-256: 4e9e668d89efdc81c38c25e72aa92bb419b8433ed1d5eaa5ca4e864d8a178f0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to a network of potentially malicious sites, possibly for SEO abuse or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://matchonusa.com/uploads/files/44405498232.pdf In PDF document text
    • http://marketingnews.fr/images/file/xolowitetak.pdfIn PDF document text
    • http://gnox.vn/upload/files/53618838753.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/jizakobexaxanuzizubobuw.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/depeniwapimitolofekerexe.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/guvogagig.pdfIn PDF document text
    • https://onecre.com/images/content/files/watenibefugedarebi.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/xowedogapawitup.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/lbmpk0gnfkmhkaqc94hku4tq95/bawunanivajoweme.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/mimidifaverudoj.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e060e42fce---60473623988.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/76950191205.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/5154893952.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/veluxijani.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/mizezagulakezuremugarub.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/dikidatuwomoduwubupa.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bejabapadede.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/mezibobatud.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/gexasuletizixerux.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/93829694940.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/pisej.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/140947505502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=180+degree+screen+rotation+androidPDF 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_off0000b574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB574 18924 bytes
SHA-256: 26acf166c985e486cce956f4b8baa4310e746b123635c6889369478f8cb1b8d8
font_01_sfnt_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 10784 bytes
SHA-256: 80261f234fdb2cbc408d1e973553946ab657d757915b6cbc19f42da05f022e74
font_02_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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