Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ddb1b81a57cfac…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 23:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed255a6db82e72e8d0dd08d8acf0b5ec SHA-1: fd48d5a93ff745f217590022257e0d40fadeb015 SHA-256: 04ddb1b81a57cfacfd57194ee3c296b202c94afb4c1633251cb9dac3fd3a2818
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to domains associated with link farms and disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://naplesredeals.com/userfiles/files/jejotivalotenogimugesaxi.pdf In PDF document text
    • http://h04ydivan.ru/userfiles/file/39943185734.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/20251427407.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/nurexukebetegelubu.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/mavukuwojofar.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/96649167288.pdfIn PDF document text
    • https://atavio.ru/files/file/xasowebebizakavitewunorab.pdfIn PDF document text
    • https://angkalaris.com/contents/files/50044673365.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161382c554540f---11380853737.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/77705342770.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/guvezitukisumubi.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xuwofezazumukaj.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/vuxojudusivukelilawizob.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/tasapetis.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/watanezivevewonoraramite.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/jovabeniduxadumorejubiran.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/30215007941.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa876d166---xamibojonidotigadive.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/tikimimamibuvikono.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/32315992413.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/32586660588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+spiral+saw+movie+online+freePDF 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_off0000c550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC550 19604 bytes
SHA-256: 2f661b68af05a41a2c9b94d33b7d849e06148a8895fc2ebe290ca48be850d11f
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 10888 bytes
SHA-256: 1a126d8200d9d8e9a79883687f3bfcadbabc154953fe44ff9230d021badb69f4

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