Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11a78fc2f8e3834…

MALICIOUS

PDF

79.1 KB Created: 2021-01-23 17:25:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0557679e4b88e265c5e9d92722560e07 SHA-1: e2b7b4d76c7e8d7f8ccd4d7e2b24fd94e1a76c34 SHA-256: d11a78fc2f8e383410ec9e8cc81eb8340b4a967b9820be2bf74acce10f5c01bb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=piaa+district+6 PDF link annotation
    • https://cdn.sqhk.co/wodabakope/idRzgj2/5479143331.pdfIn PDF document text
    • https://site-1171435.mozfiles.com/files/1171435/eagles_greatest_hits_vinyl.pdfIn PDF document text
    • https://site-1168274.mozfiles.com/files/1168274/36784149451.pdfIn PDF document text
    • https://site-1174463.mozfiles.com/files/1174463/fewanemogubum.pdfIn PDF document text
    • http://sudejiw.22web.org/76844455211.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/xgqiKii/30980815175.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/ijcDjVz/rv_park_campground_for_sale_bc.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/iaSHhgd/legendary_weapon_stats_fallout_76.pdfIn PDF document text
    • https://site-1167955.mozfiles.com/files/1167955/capitals_of_countries_list.pdfIn PDF document text
    • https://site-1176407.mozfiles.com/files/1176407/58184366286.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lizapulin.epizy.com/wow_classic_druid_moonkin_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/business_intelligence_carlo_vercellis.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/jaan_bahut_pachtaoge_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/bhagavathi_video_songs_hd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 4508 bytes
SHA-256: 137735305706d517ece85f1f56ad80287a8f24ae9a34491c8972e9216a7560a0
font_01_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 11672 bytes
SHA-256: 11ccd72206d07039f84fe3dc0403e61bc41e74d96480a1db6f0b2e75271917b8
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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