Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1eb1018f865ed3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 21:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cce2d5f9135972edcaceafd77ad88314 SHA-1: 1de7e1eda3dc51c643edbd3903cdb39c3bed9bac SHA-256: 3e1eb1018f865ed332030b96940f286b75705dcf5c718b7abd3b46f7c665ba51
134 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many of which are hosted on suspicious domains and appear to be disguised as download buttons. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f81ce088a---nodogagagiga.pdf In PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/60158833949.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/35595406581.pdfIn PDF document text
    • http://metapolar.hu/tmp/xubilidozadabefudodureli.pdfIn PDF document text
    • http://learningkey.org/userfiles/buxufa.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109010629593618.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161376a694bbf0---denaremimut.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/rakidapovejatakifijozusi.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/relataxubujasud.pdfIn PDF document text
    • https://kiptep.ru/file/lexojunovewabujeduseza.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/86159116339.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210902165924_1743654056.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/31021841882.pdfIn PDF document text
    • http://underbutter.cz/download/foto/purovezapopived.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/nidisovojelam.pdfIn PDF document text
    • http://huntland.hu/upload/file/4277767686.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/89208442551.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/86596494623.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/zixugokogazajud.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/gariwimotumuz.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210902121758635.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/bozisapoxorefe.pdfIn PDF document text
    • https://austarpharma.com/upload/files/94387498464.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/buwubasiruwenuwopevabebof.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/mafepox.pdfIn PDF document text
    • http://manenshop.com/upload/files/pevetevepitanikugepujab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+turn+off+clock+on+lock+screen+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_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 10740 bytes
SHA-256: fecf178bfcdbffb7bb64c736df8f9c3530eaf5a5e898b497c4e0dd4a948ab5f9
font_01_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 17740 bytes
SHA-256: 98e7a78fbfa378cba767049f91225ffa306d34978701edad862430e752b355c5