Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabbcc577d2101eb…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 08:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ce9cd6bb48e82c7d9183425415af590 SHA-1: 031e8db41cbef9a35f748cf4f95092a8157a5b7d SHA-256: dabbcc577d2101ebf3f4cb33bec42234bdfeff2d57730ecfc5e1cbbccc48951a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external links and the heuristic firings point towards a phishing or credential harvesting attempt, possibly disguised as a software download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kronospan-mofa-hungary.hu/editor_up/posigodesamibefuwomafitos.pdf In PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/kubijerusuwifovoboduzin.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/80699889047.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/buwipiwiduxikomuzokebiboz.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/33169868529.pdfIn PDF document text
    • http://kag.fr/userfiles/file/fatax.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/kadokekilotigoze.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210901233213.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613319e60224f---nikagofaribovofuxeneguxol.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/pagaturarezikuroz.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/xijizojigoludewepamar.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/vewuzi.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/kawabuvokaxalapaf.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/zopurafe.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/34318398357.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/pilaxiwoxugaxuwu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/ferilalubexedolef.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/50055855450.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/37728731394.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/linomomugudozana.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/noxezuzawonezo.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/samurenofanevilenunidorav.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c58712499---fobanemuxiz.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/giwodoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+free+apk+betaPDF link annotation
    • http://b2cdemo.tickets.com/content/files/43399237393.pdfIn PDF document text
    • 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_off0000b462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC79 10364 bytes
SHA-256: f9ac7a80424bba869a42e86276e865dd37070d14b68446930e99916fb91eee72
font_02_sfnt_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 15216 bytes
SHA-256: a0c362550aa09ade28779c0fc36f0f4c99125cb3ddff157cba89fecf33673ba5