Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e54577905c96074…

MALICIOUS

PDF

74.6 KB Created: 2021-09-10 01:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e91f52ce469a09abde98ed6dd422496d SHA-1: 2c91e6e92225552ba70b960baa56a34e99d5f1b9 SHA-256: 1e54577905c96074540c6e0cb5ef85b07b65d1b36b86ddac7434102c722b2247
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically calls out this behavior. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's used to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://clickbox.ro/images/file/xonaruwujutugo.pdf In PDF document text
    • https://harom.ro/files/file/48362374856.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/piwogubidemojapewukuteli.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210910_F00692BDCE44E234.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/zosaronulofijozo.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/wefejufumawiwifiw.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/71862603887.pdfIn PDF document text
    • http://innotack.com/userfiles/files/woxere.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/24959470292.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/52592481014.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/90956422111.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/70608286201.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8b4b85fad---94573629271.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/dozakidawutotodasiberil.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89132841709.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/fisufirewo.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/jekef.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///gufavo.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/75039436737.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/liwek.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16137b653cc356---batuvexi.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/96475294916.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630643110.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/27241819814.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/1883051100.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/14323620443.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/90434592470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=psp+emulator+for+android+gamesPDF 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_off0000c153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC153 10944 bytes
SHA-256: 2d5008bf4b9b89f06ff9ff0593d3ed1121841df9dea654ac846f673d163a855a
font_01_sfnt_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 16476 bytes
SHA-256: 758418979501e78760de0ee05c9c036eff92c78f7ad353fdef6b9c3686987ea1
font_02_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1