Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6238f1f8dd30b8f…

MALICIOUS

PDF

84.2 KB Created: 2021-10-11 10:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0537ab0cee2fa27b2950190f6237d238 SHA-1: 43133c2e099dffaa136fd031ce5dfb66c41f43ed SHA-256: f6238f1f8dd30b8fce3e764b1414d0dc126f80775eb6251e77fcb061d50ba081
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cjmfgx.morefriendship.com/upload/files/jozogiwemivexutik.pdf In PDF document text
    • https://jewfri.kr/files/image/files/fogelulos.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/jiwikajuxomakizolijuzuma.pdfIn PDF document text
    • https://x-software.cz/data/file/lixumuwirixevuxafididafak.pdfIn PDF document text
    • http://machin.kr/userData/board/file/60886975340.pdfIn PDF document text
    • https://desmar.cl/gestion/admin/images/upload/file/lizogarafazomilidisuro.pdfIn PDF document text
    • http://th-hl.com///upload/files/76860116439.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/diwuduribapaxixelivaru.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/nerufezajilug.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/limojozulisizakorode.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/50873507052.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/potutuf.pdfIn PDF document text
    • http://underbutter.cz/download/foto/jamurixetipaxunupu.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/92407732905.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/28636658613.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/wisuwivobuwijaranoladokam.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/55945323931.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/balulugefuxano.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9a0ee029a6bb781dd874bd5dfd8b612e/fijap.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905105952973786.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/93775512358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=difference+between+blue+screen+and+green+screenPDF 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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 10860 bytes
SHA-256: c1313170594dd878da67784379dab167a33db952340f165246ac8f58210961fa
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 19948 bytes
SHA-256: 36679e5e18357b52186e660e0427b71842d4941bf23e6de09ae2869fbde4ef70

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