Malicious PDF — malware analysis report

Static analysis result for SHA-256 24133b8ffd338a06…

MALICIOUS

PDF

141.6 KB Created: 2021-04-15 05:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c6743d8627dabca2e4c0e4ce605239ff SHA-1: 2481e7f4e789e91118ff779f862eac20bf0565fa SHA-256: 24133b8ffd338a06c11d74a98da1f7fe89a7c387ee5f46aa9d52518f63379505
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malicious content. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, and the ML classifier strongly suggests maliciousness. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious intent, likely leading to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=share+market+basics+for+beginners+pdf+in+tamil PDF link annotation
    • https://cdn.sqhk.co/gixenerusivu/hcWRUgj/kebifabafumadeka.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/MEvihM6/gesilunexebawopilunur.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/93Uigif/chinese_birth_calendar_2019_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/dhghdHr/13077342951.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/cjjgfgd/ai._type_bot_keyboard.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/ujbnfhi/fun_run_3d_multiplayer_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/luwonowuwig/a9CTFkK/sherwin_williams_paint_color_crushed_ice.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_2b30a12df6d346a1ae3d3b4405dc6d0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bed5bb6-2587-4ca4-9c20-8d297a99d7c8/rakegijasogisonuvudeve.pdfIn PDF document text
    • http://piperopire.rf.gd/livro_parcerias_na_administrao_pblica.pdfIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_50c6e331e8fa47a7900913f48e06c5eb.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_f73fb66436d04293b963d483937bfb37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d3c9c2-a20a-4ac9-9fe7-60f6c62135b4/kenmore_80_series_washer_wont_spin_or_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d134a6-37ce-4c14-8bd3-23e2158238c2/funuwajakaziguge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f9a458-3474-4e96-99b4-d931fbd0ec08/1238050021.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_7fdb7e44ee394d26ad4a95388233ed34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5caeb1c-5181-4eb5-9862-7072938c6ab4/linux_command_to_check_disk_space_percentage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9696c201-bffe-46da-b443-bb9dee69ffd7/badonup.pdfIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_6f48a59252a045b88499ff4f370db84d.pdf?index=trueIn PDF document text
    • http://kobaguwo.epizy.com/comparative_and_superlative_adjectives_lesson_plan.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
stream_003_off0001cefd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1CEFD 20556 bytes
SHA-256: d3ee7277011620eb7330fc668bac781ba2a94ba04ee958ce830ea2e02ee130b8
font_00_sfnt_off0001bb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB33 5876 bytes
SHA-256: b994aa38bf3fc2de7065c69c75d52f294c5c84cec276c4b1f8ece3cfd3a81452
font_02_sfnt_off0001faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAFF 13180 bytes
SHA-256: 7d11c3872ae4611e7975733ce0c6920bf4df61af2431b63ba559770ae91741a3