Malicious PDF — malware analysis report

Static analysis result for SHA-256 e149e31c3a53faef…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 19:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d57271bcdb9b4b445f40ce558495030e SHA-1: 750038207b025dc6508c50032513ce1ef71391e4 SHA-256: e149e31c3a53faef1481f922bc719209103e5126ae896a871960264c8da69bac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to PDF files on disposable or unknown domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://skolky.info/foto/images/file/21244938592.pdf In PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/xegume.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/kedox.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/26229877693.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/64910095575.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c096270356425720f8afc108fe590f5c/53712956109.pdfIn PDF document text
    • http://autovoda.ru/upload/files/64748315052.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/94730659906.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/2650647782.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/77007409361.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/88959527802.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/vozunag.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/kulaxududiwibofimujixinu.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/52934594319.pdfIn PDF document text
    • http://keacg.com/upload/files/kurafebigutowal.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/64988049689.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/4935149568.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/32211974090.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/juxifapelo.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/10840005277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=microsystem+bronfenbrenner+examplesPDF 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_off0000adf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF0 10988 bytes
SHA-256: eb0c331bfe344b580b29cfec72c6651ba3dc63478e199a1869e3e8fca4f2e890
font_01_sfnt_off0000c751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC751 17488 bytes
SHA-256: 3ca40db5102e2f65c30ff2ace08be2ebbbc1f3690f13a82cb0c0a106f1f5ee2e
font_02_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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