Malicious PDF — malware analysis report

Static analysis result for SHA-256 941f51b604603921…

MALICIOUS

PDF

77.7 KB Created: 2021-10-06 14:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3517ec3c20538b891717b60c23ba12d3 SHA-1: 7ab0c8b55ad25a56e8f4f8ae042469bd676dae2b SHA-256: 941f51b6046039212b29736efc157042f9c15cb90e4b5f6a77098cad949661b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the presence of numerous unknown URLs suggest a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/22505835359.pdf In PDF document text
    • https://juraganmonyet.com/contents/files/wagekuburulipawenatewaza.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///32783890355.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/jujefepukaletogako.pdfIn PDF document text
    • http://fini.hu/userfiles/file/70354025575.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/wesenevalubunalek.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/madupu.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/58922955837.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558edf0a04b---zituko.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/ruzodomara.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149d6642ff37---35836336997.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/20890041575.pdfIn PDF document text
    • https://cowik.pl/upload/pixidizugawaxowinugidesif.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/33266672344.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/86053657954.pdfIn PDF document text
    • http://7profi.net/userfiles/file/99861355575.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/bilogegokidizap.pdfIn PDF document text
    • http://www.bandungmesin.com/file/zinivaguxitive.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149767c36f95---3729503492.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/fukajoxuxibedezijeji.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/4261997768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=10+ways+to+reduce+pollution+in+the+environmentPDF 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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 17712 bytes
SHA-256: e046c15b1f5393c44af895abdf4807200c2004ffda446e85d7370d96c9f5554b
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 11224 bytes
SHA-256: e4472a3888bd7032f480332e31a84329edf27a712febd4279b774df64cf4f9d4
font_02_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.