Malicious PDF — malware analysis report

Static analysis result for SHA-256 77457a770dd63333…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 14:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4049d44050fc45b85903795bd316ec50 SHA-1: 07c40ce1684fde6529251bd00e373a1875795043 SHA-256: 77457a770dd63333efdf2c4ae21ee8a9f0879f0f2ba2b03376d41340c30dee0b
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one identified as a link farm on disposable hosting, suggests an attempt to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking a download or call-to-action link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amunt.madteam.net/ckfinder/userfiles/files/zamukutosej.pdf In PDF document text
    • http://pinedafoundation.org/imageuploads/file/dakenabajur.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/6262024257.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/21096489529.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/boxulufabelabuneta.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/97836974787.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/gebijurupisifotos.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/sefuge.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pehietjto1f3uvmu7q4eqtqaqj/defivudo.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/94888555555.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/3886295928.pdfIn PDF document text
    • https://0900107678.com/upload/file/jusezug.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210914_DFF1EFE5BF81EC39.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/13588765899.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/87465894552.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/nikun.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6267a70d---88685443888.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/45172947168.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/muvoxemefomupaxu.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/94291889743.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/92729041090.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/bemuwawi.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/teroforewe.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/ditepatowawujoredowerinar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=file+manager+extract+apkPDF 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_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 10600 bytes
SHA-256: 76640f5c215044e1e68acf9e5c20d8d7f1b8cbe9a5435fd24fe57018fd56ea9e
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 18376 bytes
SHA-256: 0b84a3e44c90ef52606e3fa65c0f52c7674ae8e81c642227e5ad285486e053b9
font_02_sfnt_off000127ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1