Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71c3948bc431655…

MALICIOUS

PDF

76.4 KB Created: 2021-09-23 10:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50f585a1d8e449aef7d8eda5d91d9628 SHA-1: 7c86ece06e44eb70d3a47813ba7163486904b40c SHA-256: e71c3948bc431655ff52aa86fdda3bfbc11177b6ae0671323f47a79fc05bd6a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect the user to a compromised or malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kudutowari.pdf In PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/64149926875.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210903_231300.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210903000943_918985476.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210905_872F64EFF65A2E8C.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/gikelikanomowumowor.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/38736925445.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/tivipigonofekefetapimip.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16320849345737.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/79430936398.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/3458568371.pdfIn PDF document text
    • https://wittnebel.dk/file/10768911616.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/59716094206.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/17121571936.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/85445362874.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/76863049880.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210914150718.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/xofidamimusosuj.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/fexewimujuviti.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3379abaf0239a64b80a2aac4547d4716/wibep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=play+store+download+oldPDF 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_off0000c9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A7 16656 bytes
SHA-256: 1bf0537b950fe018f9683b2683981a55405866c7a622bb35ad69eef566c840fa
font_01_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 10352 bytes
SHA-256: a298a5864ef27c75c2becd8c26f38038b9feb691849f9093c9c5634e60275bb2
font_02_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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