Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7aeaeffc4e302be…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 10:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bfc28043132ba0a7c4d5ff3b2866ca7 SHA-1: 8e5626d18697ef3f5c02c053def30d6c63a92e1c SHA-256: b7aeaeffc4e302be93a9ea3001f29cf8312fcdb92b4c7fb0f1538305dd8775e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely involving a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://swift-tw.com/lcc/upload/files/47114662922.pdf In PDF document text
    • http://studiotecnicolari.it/userfiles/files/xodijepamu.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/92249799897.pdfIn PDF document text
    • http://machin.kr/userData/board/file/visazawugudesirosifo.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/48562880180.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/keguwimemadokumopo.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/58188961481.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/20822540160.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vb0l4rgc1do4cu7d45dk0tace3/vomafik.pdfIn PDF document text
    • http://rc-modeller.se/images/file///jobabosomuromesasuvajelos.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/58592621769.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/gixamoxifirifiwuzef.pdfIn PDF document text
    • http://snft.ro/media/file/43321273640.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/negusolijoja.pdfIn PDF document text
    • https://kuepancong.com/contents/files/mijitotixalefovoxotuzi.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/84618286703.pdfIn PDF document text
    • http://findacommodity.com/upload/file/38625622935.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///18376940624.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/84420039430.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/84040787790.pdfIn PDF document text
    • http://potlista.com/file/files/zavukatij.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/fogosadanikigakobubu.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/bigobafukajitetonupareliw.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/misisovagubutibaponu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6f21b35d---tatudujas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tomtom+app+android+tabletPDF 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_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 16800 bytes
SHA-256: d8cd817cd0d22b959ec0b8d99f0e78404cd83f3a6fefb5ba4bc3223f34f6a85d
font_01_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 10488 bytes
SHA-256: 32ee0d800a6256b687267e77a026ffe6032ebaa7e0809908435fe672aded0a30
font_02_sfnt_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1