Malicious PDF — malware analysis report

Static analysis result for SHA-256 424a168b42503a6b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 23:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fc95d2c464616a259f20cfa9b2210819 SHA-1: ccb5948b800fdda9532cbc2e263b2daf5a408117 SHA-256: 424a168b42503a6b609ed3aaaa9e8d26fcd5b55649ccce9217bd6fd93072f70f
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://qlionshousing.ca/userfiles/file/nigodefomotusovujedinit.pdf In PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1b2a55cc---vegiwenetadokativ.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202196131532210.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/jakusujo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613586421dca0---fodumexafirajimedam.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210908012945.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/nizatedodi.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/93427683285.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/kabojokolo.pdfIn PDF document text
    • http://www.bash.cl/media/file/paxiwolugem.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/88119339632.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/98505222800.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/wusukojorapikibovaloz.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/33609953766.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/fifafera.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/zabomadeku.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/lotelan.pdfIn PDF document text
    • http://kelsenator.com/userimages/45363217399.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/3195557416.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kizupokadixivepat.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/vifaxeg.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/89979197825.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/90693526401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=d+se+words+in+englishPDF 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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 10356 bytes
SHA-256: 9262ad10a96e23c69e4c771fea8e66e7f5bc088696b8fc9322622b8f0d99946f
font_02_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 16528 bytes
SHA-256: 7948887c9c83ec780118832d3b9eb32480472b0774acc57cda6bd3982626eefe

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