Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b106ac86d105587…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 07:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: edf3c7737ec3eac54c82780dff334d8d SHA-1: 9354bc7db110aa5c4a51f8f0ca63a5004ee5bcd7 SHA-256: 6b106ac86d105587b201d8c0a22f3a2117b20d53719e415e6a440a0f9dc58819
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content, specifically identified as phishing or a trojan. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a common attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://nomylo.ru/uplcv?utm_term=file+explorer+for+windows PDF link annotation
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3702480a---45886246013.pdfIn PDF document text
    • https://unaizahic.com/Files/files/tepagigixujosilenetebe.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/zelaxe.pdfIn PDF document text
    • https://blugarden.eu/file/49329948817.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/leguxejopiwugefusuma.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/dejom.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/rigewesariloruwusifidel.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/18503655219.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/zavum.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/rakobitepafumova.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/71238892131.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/24202223606.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/30428848724.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/5460710858.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/10075757916.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/86644592697.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210905_5997174ECFF859F5.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109110014381722.pdfIn PDF document text
    • https://ewt.cz/res/file/71210214124.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/savobefigutagileko.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/40420716672.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9p82alsqdetsrkg4d88smoug26/kinadugizinevujuj.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_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 10396 bytes
SHA-256: 5c27dc5c0ce4c4899bf520826d6ad573ff65f13d28967f9127dde0960597dec4
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 17980 bytes
SHA-256: 3c22c830124c50afb88608d413be3afb167232a7f4754a72395acf6be7f7a4c2
font_02_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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