Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0a495f56385d36…

MALICIOUS

PDF

82.3 KB Created: 2021-03-24 08:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 57a132be8eb7a22f49f326b1a8b8afcd SHA-1: 721a802811f89f9452e5ad1a108e4f71cf0280ad SHA-256: 4a0a495f56385d3618299911c4242149f741438fa31fbe5b07cd6bef4a6e0e93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=insulin+therapy+guidelines+pdf PDF link annotation
    • https://cdn.sqhk.co/jejekije/ggiQja4/gulopexomegomone.pdfIn PDF document text
    • http://gufutaca3.xyz/nimereripogemurabotolaji1zfmz.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/gTqihhf/23184089230.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/RjeOlgh/rocket_chassis_racing_school.pdfIn PDF document text
    • http://hytri.com/rakegiwobofotowiguxkub3u.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/V5ib5nh/18196744519.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/gr2yTgh/57325807612.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/hX83iS4/iphone_6s_matrix_live_wallpaper_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/icQTjhk/line_of_defense_tactics_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/serojimo/bWDhahi/forawulixajejukuteliwuw.pdfIn PDF document text
    • http://ig-copyrightviolation.com/what_is_the_theme_of_the_short_story_harrison_bergeronssnkv.pdfIn PDF document text
    • http://mrshadow.net/download_game_revenge_of_warrior_mod_apkklm8q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f08cc92-181c-40fa-b631-2a802b94faf1/71067679121.pdfIn PDF document text
    • http://tabumuxiwuno.rf.gd/beaded_formal_wraps.pdfIn PDF document text
    • http://vanosojude.epizy.com/bonefish_grill_menu_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0101121-f3e9-40cc-94a9-9d33df9b06ce/prey_michael_crichton_book_review.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 5344 bytes
SHA-256: f3e0125e20e491b680ef9c0128e868f2a8c86afca68272da264b9d0d73d5a19b
font_01_sfnt_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 10960 bytes
SHA-256: a7b95d28bd1baa244ef9848db05301b9df8a4d84bb7f3e3e2fb68937702a8dc0