Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22b3f3dbc74c8d6…

MALICIOUS

PDF

76.5 KB Created: 2021-09-21 12:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5436e0f9f589e95ecf4a869db4a26816 SHA-1: d28feac33b986f942a356da145518b7c6a7b7eda SHA-256: b22b3f3dbc74c8d61cda66b909c6d361358e01f33370c260fa1d4ce51476d880
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. ClamAV and ML classifiers identify it as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://tomaszfilipczak.pl/userfiles/file/5729335080.pdf In PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/liwonubipoworuza.pdfIn PDF document text
    • https://tanvietnamdinh.com/uploads/files/36609296996.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/sovasozokalelunava.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/zilamow.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/79081840656.pdfIn PDF document text
    • https://recrut.com/files/files/dadirekotigetoje.pdfIn PDF document text
    • https://kildevangen.dk/files/86612152032.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139522c3f572---girabowotaketus.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/mepozase.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/36513844622.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/2280839513.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/joniperudam.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/52670527280.pdfIn PDF document text
    • http://lovesenergy.com/file/73963837832.pdfIn PDF document text
    • http://xprchemical.com/upload/files/76977174668.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///1465224413.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210921_060542_114.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/masenekurujafadubi.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/buminewelelim.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/futawixofusitijapitoda.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/84298209844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=madea+goes+to+jail+watch+online+freePDF 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_off0000c579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 17596 bytes
SHA-256: df0eedfb6d67afd6e867b897e0bc494069cf7a5f79f20e67e337c308e56f1c91
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 10964 bytes
SHA-256: 7982164b92baff72ea530671f640c18d932f3d6b8a1d086986ace7568f8ac15f