Malicious PDF — malware analysis report

Static analysis result for SHA-256 571359e41686bf63…

MALICIOUS

PDF

92.4 KB Created: 2021-09-18 04:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53bd9957b1d0dd3c1456f7f741c1e729 SHA-1: c33e743fcaff0c77d4be1d2e477f08bfadd14f07 SHA-256: 571359e41686bf63c603614825c5db84c539bd0b080b5c6b9e3af07091a5564f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct, low-reputation URLs strongly suggest a malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://qualitygums.com/userfiles/file/gobunurebunesamisebamu.pdf In PDF document text
    • https://paulogomeslda.com/userfiles/file/nudaxopajajefabeleri.pdfIn PDF document text
    • https://apra.pl/files/file/10800841839.pdfIn PDF document text
    • http://mobitransjogja.com/files/redazalowonapexokenaza.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/33334310176.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/34075824368.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/terapopopuf.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/selofidosewuvunurev.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/55313258720.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/43510622604.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/96079366906.pdfIn PDF document text
    • https://airbays.com/userfiles/file/taletewatozadefavenav.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/49216513963.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/xufetutejurakepunimasoror.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210906171032_1446183763.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/jexurerokum.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/dimavusisif.pdfIn PDF document text
    • http://calisnt.com/uploads/files/70541905894.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/muwawetaratawisudexonaki.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/16484172563.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/wilixigasixikawe.pdfIn PDF document text
    • http://iviltra.lt/images/files/94815012422.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/luzatap.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/129e6102737248071cad6575806fedbc/45808384436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=love+story+erich+segal+read+onlinePDF 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_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 18560 bytes
SHA-256: 0f9f7f0bda5580a944447134e19ac2e3f8d3aee23748a0ab4599e6ffe6ee9ed5
font_01_sfnt_off000132fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FC 10788 bytes
SHA-256: c938ed075eef799ade63f7d2cdef634cfee2ca8b4fc24f81751a6f008cc4b7a6
font_02_sfnt_off00014ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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