Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffe99278f6bf642…

MALICIOUS

PDF

76.3 KB Created: 2021-01-09 23:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1b3f81cbd41365b9e5fb3de7edb0d538 SHA-1: 7148cd9d9dfed779b7875980a73306b8e9284acd SHA-256: 4ffe99278f6bf642fc5ed91a3a60fdca4adf39f4d746740974677c0d52d33fe0
184 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate it functions as a link farm designed to direct users to potentially harmful sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://traffmen.ru/aws?utm_term=short+form+bill+of+lading+sample In PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/field_hockey_goal_width.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5fb4ff324d0fc.pdfIn PDF document text
    • https://site-1176079.mozfiles.com/files/1176079/download_game_war_of_empire_conquest.pdfIn PDF document text
    • https://site-1173941.mozfiles.com/files/1173941/19319099416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f88677596891.pdfIn PDF document text
    • https://site-1177469.mozfiles.com/files/1177469/dungeon_village_2__0__6_mod_apk.pdfIn PDF document text
    • https://site-1167955.mozfiles.com/files/1167955/mass_mayhem_2099_ad_hacked_money.pdfIn PDF document text
    • https://site-1175916.mozfiles.com/files/1175916/bomese.pdfIn PDF document text
    • https://site-1192771.mozfiles.com/files/1192771/teaching_strategies_gold_objectives_color_bands.pdfIn PDF document text
    • https://site-1176040.mozfiles.com/files/1176040/air_traffic_controller_salary_new_york_city.pdfIn PDF document text
    • https://site-1178703.mozfiles.com/files/1178703/rc_airplane_control_surfaces.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/91537052406.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/57297884117.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_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 5696 bytes
SHA-256: 5612587a48be43062b3b6741af2ed2082b71c3591b7f8d71ad8f6a92bf282b35
font_01_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 10888 bytes
SHA-256: 860dc3a7b7ef1e73b2feaecb0e60ab0f585db3484e014506f1bbea1cbee4d647

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