Malicious PDF — malware analysis report

Static analysis result for SHA-256 825e8df41eec03f0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 18:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a760d7c10fdb1025aecfceb041c18da SHA-1: 58ab9fa40af1058ce0117681d353ce1b258b03b5 SHA-256: 825e8df41eec03f0eb661fab69bdd1670c05cf90c5c341c6df5a384b5054e624
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically identifies it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/uplcv?utm_term=fragment+on+back+pressed PDF link annotation
    • http://gcsiva.com/files/userfiles/file/zadabet.pdfIn PDF document text
    • https://fuoriscena.eu/file/lojatunemegabudekibu.pdfIn PDF document text
    • http://vejwun.cz/images/65742054777.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/nuxajukasevikilonivopor.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/88344185806.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/sugiguvusalekukemupud.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/380761751.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210903042909.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/vigiduruta.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131f393ad614---62550309102.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/23567226499.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/39167247854.pdfIn PDF document text
    • http://szm.hu/userfiles/file/25155445851.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210910143413662.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/44224710981.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/87130120139.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/79885230241.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/76607438779.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_off0000c9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 17812 bytes
SHA-256: c5c75c2afddcd779b7210a6f51c225b5a505e7630c0de74d90d672f6683dfbe6
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 10928 bytes
SHA-256: 74ee2f534d8cb36d4d093c3d1c3bcd4d2a8867689e13d2e5daf3db02172e2024
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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