Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee581ccbbe9b2797…

MALICIOUS

PDF

80.5 KB Created: 2021-02-24 05:07:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fd7c56c9ad6aa6753f784968d1a1b4c3 SHA-1: 1fdf1bc2de5f78265730296eb7cb8fef109d2e0b SHA-256: ee581ccbbe9b27971dc0a4388a0f44f1b94266dc5746fb6346a0c033e980ac9a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure (https://crophysi.ru/123?utm_term=digitech+rp250+price). The document structure and the presence of many links suggest it functions as a link farm, designed to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=digitech+rp250+price In PDF document text
    • https://cdn.sqhk.co/gegefemorosu/giibDhc/spellbinders_platinum_cutting_plates.pdfIn PDF document text
    • http://svoydvalend.xyz/pc_game_benchmarkgp07w.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/ajdUhbw/scoreboard_field_hockey.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/jDihBmW/game_center_apple_sur_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/c51ihgi/othello_board_game_argos.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/gjiizdb/flags_around_the_world_with_names.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/tK6G8gh/jebigipuvajopudex.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/9hai1ie/business_intelligence_manager_description.pdfIn PDF document text
    • https://cdn.sqhk.co/xanovika/hcjhcRU/fabixisi.pdfIn PDF document text
    • http://wadopipojadali.iblogger.org/rang_de_basanti_video_songs_hd.pdfIn PDF document text
    • http://fb-copyright-help-from.com/doubt_a_parable_themesxqo4n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470017/normal_5fe211f2454a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470533/normal_5fd6e3e3435b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loxosufodu.epizy.com/pipegolule.pdfIn PDF document text
    • http://gijomifede.rf.gd/2257603499.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_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 5172 bytes
SHA-256: 0ceeef089d4e613a95ba348e88dcd28f1b04d69aa09c6fb842cea6af7e06a334
font_01_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 11288 bytes
SHA-256: b9e6868a672f4fcadaec69bb058475e5fae03d6ee8ad2a1eb7108fda6f274167

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