Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8ed7774704096e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 02:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57225e77321fc069faf5de2f01bebc4d SHA-1: 411013465c4d0e9cc29e71d484dee8d9d8033fa2 SHA-256: 5d8ed7774704096ecb00f138b31f4e6371ccb71ef1f4e3702792afe5b14004f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://24horasnoar.com.br/ckfinder/userfiles/files/23028981412.pdf In PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/92961356412.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/vuzox.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/87689406822.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/61920999068.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/2225435478.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/25887015768.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/gojotozadogogidexe.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/98212189189.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/niderogigidoxomabopiro.pdfIn PDF document text
    • http://npas.ru/pic/file/63808255040.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/ruxadup.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/kujuwiwoxafokudamubu.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/pozerakunuper.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091308070269.pdfIn PDF document text
    • https://begili.com/uploads/image/files/zimavepa.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/67179480818.pdfIn PDF document text
    • http://0048.pl/48files/file/lekigusefuwisufasup.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/mazivudumazuteramepatake.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/balunopazejilopaseluz.pdfIn PDF document text
    • http://devison-matras.com/upload/file/25630931027.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/befevagibalalukinuk.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134f70b3fe2a---doxorudofimewo.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/5200856392.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/5239378532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=turn+off+sms+notifications+androidPDF 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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 10520 bytes
SHA-256: 960a628cbe108aaddb8901a599475a14b77585d2542eb1f3ad7fd3bf88f575b8
font_01_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 18792 bytes
SHA-256: dfb1a66bc39f544e4dc96c13bb33cffd653fb05a03cef0da7a83d5ea5b8f81c6
font_02_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1