Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf635bfaee11c1d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 14:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cdcf09d322f547d260383580a2a2a76f SHA-1: f04c68485b1602386f49888cdd24a31e9b5ace53 SHA-256: 1cf635bfaee11c1d8035da2e101816483b8d45ce2a1f62bd219bbbca0a1c2b70
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm designed to host malicious content. The presence of urgency lures suggests a phishing attempt. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a common phishing or malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://stonebuild.bg/f/uploads/files/21472005924.pdf In PDF document text
    • http://seattlebestteriyaki.com/uploads/files/jeloxevopaxa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/629d24c1a2c086673e6d04f35d331e98/bijasukeru.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/wovupatekoxalobedugazul.pdfIn PDF document text
    • http://liyangah.com/Upload/file/sinodazuxoj.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/kebatumuzexuxonojujimefa.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/bokenajirigetipegebulelum.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/14028118346.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/36532664790.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/rowozofoditewiluxolodepab.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109051633559600.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/xilufe.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/sizekiju.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/tisifu.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/govudu.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/97059607625.pdfIn PDF document text
    • http://apcmagon.com/userfiles/52108441635.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/94110155026.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/pemidelotenobujawuzijax.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/zosagujipibinulinorope.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/dobojuduvarugusepa.pdfIn PDF document text
    • http://garderoba.sk/images/_file/82409922454.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137e25fe36b1---lanifusenizitomulede.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109012328415619.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/59007561196.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/24183593444.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/28999400371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=keynote+pre+intermediate+workbook+pdfPDF 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_off0000ce32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE32 10868 bytes
SHA-256: b302c70404ee505c1b90611635e6227173121d4e424be46daec8b3d2fa6c19e0
font_01_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 18080 bytes
SHA-256: 639e5ba16d9803522d5d0ece84fb149b5d2b2aab7c3de8b1de46a4560b5b4a69