Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdef9899df09666…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 02:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4da855f0408f4f7897dc7126fa19c9ae SHA-1: c25c5c1acdd8cba56efd4d042d0117944cf8cf9f SHA-256: 8fdef9899df09666c5d43348d1fc58ad2c4aa0584ed08bb8e4e32b7ba86f690e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=format+sd+card+fat32+apk PDF link annotation
    • http://studiolegalezullo.eu/userfiles/files/repewekij.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/41196033207.pdfIn PDF document text
    • http://zgic.ru/!upload/files/10956578467.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/81419785063.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/49746517391.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce7c1a324b---14992564865.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/gigazomugopigorozi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0373bdab4---tituzaxisofamejewi.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/bavimoniluzoguvosus.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/xokagu.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/rowipopajevibajepoxe.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/karopewopezuwoki.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/4984286244.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/sosaguf.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/47414159595.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/bofipapezuxew.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/tolulu.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/73216820656.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/82169953214.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/kavurib.pdfIn PDF document text
    • http://szwygs.com/upload/47224224639.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/74605957317.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/dogunakepuzomuwuno.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/wutabejolitev.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_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 10768 bytes
SHA-256: 869ba04b627a20f032ac290108a84c252ed5c0a3cfb6fe5ab35138ba67edad47
font_01_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 19208 bytes
SHA-256: f8fde94250facc0bade2e50b653fec32698ae3a1812ce87d05b847537e903567

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