Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6803d9ef395b57…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 09:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6775912adb17af3dcbd0d2d8a6f36a30 SHA-1: 11c5f6f5e523b6707551f2b354292cdfb753e3fc SHA-256: fb6803d9ef395b575beaed9152cbdb3f662bb189034871776229cfa3cd758e2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a probable attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/tgdfu47u0sqhak2edc76egtji2/mopikerizaguv.pdf In PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/51004758649.pdfIn PDF document text
    • https://arendic.cl/files/2217728155.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/zivop.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/tevamosexokabajupe.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/dufonilotud.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/22254345256.pdfIn PDF document text
    • https://autoskola-scp.com/files/dosikizepigobokawobuw.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/lixopuluzepemifiv.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/91888540648.pdfIn PDF document text
    • http://venkateshservices.com/uploads/fewagafidagemovinixaxunuj.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/fudabigubinaruzulek.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/17960060616.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/povut.pdfIn PDF document text
    • http://sushi-belovo.ru/files/16452362416.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/pudilulitogowusekojukojez.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613793cf1c019---1126659674.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/jejoguzirotowejakut.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/dawebidizexomokoxafabom.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/sanubowowos.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/44891640953.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/bepizenurovawodobukunuvi.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/rakawojepulugej.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/wanaset.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/disobefekonigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=super+mario+bros+advance+4+romPDF 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_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 10992 bytes
SHA-256: 5d1192ca9246ce69722a0517cc76d77f852d028c9f04db12d6a5f153b0fa325c
font_01_sfnt_off0000e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 18780 bytes
SHA-256: c8268c4733716d7d99142f13f75f5ed076c93dc03e5a326927d9d38ba20188a9
font_02_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1