Malicious PDF — malware analysis report

Static analysis result for SHA-256 47fd282274a1f09f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 06:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3505d7f69207103ff398dfe8c684af8c SHA-1: a60a0078de3db51fffdd89433974dc7283cdd5ae SHA-256: 47fd282274a1f09fade2026b780532740d6019555b4df815a4e8c3925de740db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links to other PDF files hosted on various domains, indicating it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a malicious intent, likely to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=android+app+lock+sample+code PDF link annotation
    • http://fixafilm.se/userfiles/file/96776636831.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/mobiti.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/10299242153.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/aa1cd546cfdf5f1b9dc9bfc34ea9083a/62646411289.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210914151312.pdfIn PDF document text
    • https://priscar.com/documents/files/99897949344.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/sejodulutilakukumezinube.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/kisefowuvugow.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/61737233753.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/gupagevufavimapekomaw.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/zuragezinomojokilerobo.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16133dec0120eb---33106197488.pdfIn PDF document text
    • http://kccmaul.com/files/files/deletiluwitapi.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/90451283007.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/43445109946.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/wobaviwavutijosadi.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/lebagiso.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/nududodozovezuvalivuduj.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/68500884338.pdfIn PDF document text
    • http://otczenacts.com/media/files/43286516498.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/nuriwoz.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/nafefuxabasameja.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_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 10652 bytes
SHA-256: 438c9cdd634212075414d34fb62cd2d46cb0f61b2b0e6ed7c65561500da3ca28
font_01_sfnt_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 17724 bytes
SHA-256: b7a0e5aceb21fa4ad52785d32d126d4846e363e29358c5997891a0fb1f13ae79
font_02_sfnt_off0001155f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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