Malicious PDF — malware analysis report

Static analysis result for SHA-256 11359e750d3b8533…

MALICIOUS

PDF

78.1 KB Created: 2021-04-09 04:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe8d4a8ac1defe62c821ff3b939dbc25 SHA-1: 5a37ee1706d907a41b5835164df453db7f7cac14 SHA-256: 11359e750d3b85331b359196419032a9c8c119e9115e4a37f5dd9af51004ecb9
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to a movie trailer. The presence of numerous links, including a link farm on disposable hosting, indicates a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://leonvi.ru/strik?utm_term=under+the+dome+trailer+full+movie
    • http://ductsunlimitedins.com/jowosakedurapuwixa4fekb.pdf
    • http://uplrezina.site/fanixiboo4ubl.pdf
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5fc7fcb919c73.pdf
    • http://servicesforsupport.com/xubivakejotufogejifilblv4.pdf
    • https://cdn-cms.f-static.net/uploads/4394061/normal_602e38bfbce0d.pdf
    • http://oneitstore.info/bid_wars_pawn_empire_apk4641h.pdf
    • http://idem-peshkom.ru/will_ps3_remote_work_on_ps4zjf6q.pdf
    • https://cdn-cms.f-static.net/uploads/4490380/normal_6058091f7286f.pdf
    • https://static.s123-cdn-static.com/uploads/4463543/normal_5fdf516b355e5.pdf
    • http://vijofogozorumi.22web.org/reason_autumn_in_my_heart_piano_sheet.pdf
    • http://presente-top.store/how_do_i_connect_jbl_flip_3_to_my_iphonelahs7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_a7e02b023cb64a289e962ce32c991a9a.pdf?index=true
    • https://s3.amazonaws.com/bejexe/bollywood_sufi_songs_zip_file.pdf
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_3c583910e9a4416f9cf36b5d5d991305.pdf?index=true
    • http://mogejizezapeb.epizy.com/g-shock_g-9300-1_mudman_solar.pdf
    • https://2a0daf8d-7d8f-48a8-9da6-1f2c606fcb3a.filesusr.com/ugd/adb9e1_dc2f5ab8787b46c7b550ef89b791da6d.pdf?index=true
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_aaa8cd562f004438a93140375e62a72f.pdf?index=true
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_12735f6434c240b9a1cef26e33f8c74f.pdf?index=true
    • http://mawigugu.rf.gd/chapecoense_plane_crash_report.pdf
    • https://s3.amazonaws.com/futamo/topics_in_algebra_solutions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f162.bin
15678e372b9bb27ac47341fe90c2b73e0039e410cf684739eca3f86a70549047		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 5020 bytes
font_01_sfnt_off00010259.bin
3bb6cbf5641cf6ca315a2ee9e09290ea0380517984b6fa0a69d76094c4b35c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 11624 bytes

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