Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0c1b0e1d6ec0a1…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 07:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f866c7182072b4df84f1158c6b970790 SHA-1: 4bb158ea3328aa0fafbeee4efa0d7ed128fcfa6b SHA-256: ea0c1b0e1d6ec0a1e58395e23337cdc52d319816660bbe763c15a536c5002e43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URLs and the PDF structure suggest a link farm designed to redirect users to malicious PDF files, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://gruppocreta.com/userfiles/files/50283777653.pdf In PDF document text
    • https://reparationmobile.net/userfiles/file/21459539176.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109190717536859.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/58322812106.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/16359261075.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/migiwupibefuvofasizu.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/18069119174.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132057fe9224---44565312760.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/2459260905.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/tokaladabubuv.pdfIn PDF document text
    • http://mextro.de/upload/files/90606380728.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xakutojevojuganirizumuva.pdfIn PDF document text
    • http://exima.kr/userData/board/file/nugizugevilosavolakotaja.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16307969073627.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/29924064365.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/35079098940.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/120957046077.pdfIn PDF document text
    • http://royalgroup.at/tmp/24714090250.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/wowejawebulepebi.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/wogegunidewomububonifatu.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/10788441150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+software+for+samsung+galaxy+s3+miniPDF 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_off0000ad2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2F 11272 bytes
SHA-256: 727cbbdcda3523624ac5cb90f89188a095f09edaefaa1c3faff147ddae1d864c
font_01_sfnt_off0000c78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 16432 bytes
SHA-256: d2e231657404ceab3a024b8c06642ee23d5ee246db731ed7648d5f6eca7f1e82
font_02_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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