Malicious PDF — malware analysis report

Static analysis result for SHA-256 8011083c3c6397f2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 09:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4536c192c7f8e5edbe0a6372a4d7ff64 SHA-1: 8456ce0e1ba10686e081407551915b01d66ea6f7 SHA-256: 8011083c3c6397f2047e183ac26d755018a738c03ec2f90089306954705e44f2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://sintjorisparochie.nl/userfiles/file/gozulivezunenejides.pdf In PDF document text
    • http://artecgroupservices.com/imagenes/file/91459883799.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/silenipetuvepaki.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/88708805216.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/mokokuguvugoboberuwita.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/nerikaxovux.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e881e302d6---kurinijub.pdfIn PDF document text
    • http://samtle.net/ckupload/files/77327371262.pdfIn PDF document text
    • https://tonitomov.com/picture/file/zofumosufet.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/60610005381.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136185cb902d---tesawazevavipixi.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/36939770141.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/wotusogaketiwagolineke.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/8714657030.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/96425273077.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/tedewevokovozukovodusaxef.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/nixuwe.pdfIn PDF document text
    • http://metallpress.info/files/1989859280.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wukopimesob.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/04/gizorevawo.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/wekotubudug.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/12884205065.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/joxefadare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sword+art+online+season+3+episode+25+english+dubPDF 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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 11500 bytes
SHA-256: 8f427e397dc5f2e843c1aca3184f2aa3ddf75a1b6d9d3c989bc859fc7bd14090
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 17352 bytes
SHA-256: 4b4706d820f54dbb9db8735d476aa4b103681fc6cdb62e644fb6135405a685aa