Malicious PDF — malware analysis report

Static analysis result for SHA-256 e14d5a55fadd4877…

MALICIOUS

PDF

88.0 KB Created: 2021-03-31 04:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5cf4fe88c794afd72ca5d4611207df04 SHA-1: 8c564c868957c9a9503140c62439b00d972e2dfe SHA-256: e14d5a55fadd4877c424b00b6836fd86b538ecbc27017ae4cdf25c7fa2af470a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=is+the+hp+photosmart+c4280+a+wireless+printer PDF link annotation
    • http://zipafaxelati.sportsontheweb.net/the_accursed_share_volume_ii_iii.pdfIn PDF document text
    • http://vonoxafaku.scienceontheweb.net/genetic_algorithm_essentials.pdfIn PDF document text
    • https://lalurarejodu.weebly.com/uploads/1/3/5/2/135297054/rumadugoluz.pdfIn PDF document text
    • http://rakivabe.sportsontheweb.net/46528802655.pdfIn PDF document text
    • http://micrometerdigital.xyz/mario_kart_double_dash_manualdbosj.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/tetuza.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/ariens_24_inch_snowblower_for_sale7zl41.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/muwekemonaxexofubumawik.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
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_fd01831501cb4cb2b1aa6f6053cb0878.pdf?index=trueIn PDF document text
    • http://pexirud.onlinewebshop.net/76977902491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4718f60d-1558-4caa-be7d-147a234f4dde/39613190419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74ec15b-e220-41e3-b22a-837823430c06/18561198299.pdfIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_4d4d0d114a634944b3a5a5ab0fdee8a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aca130d-5f9c-4c90-9248-45fd21cf7f1f/basic_mechanical_engineering_gtu_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21148700-dff8-44ee-82b8-446e681c43f8/14920476265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3c9cc4-3067-4bfc-b1db-31fa1987cc9a/32143945014.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_4672a808e465440f911f1eb3d3d43ffa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/712d9f40-f93e-4e63-8591-e2d5b677faf6/diran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ce234d-4a8d-4ecf-8138-66ff72a4e9dc/what_is_a_fanatical_mystery_bundle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71547ef5-7d5a-4035-a504-db2e08641ccf/what_is_hamlets_to_be_or_not_to_be_speech_about.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_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 5544 bytes
SHA-256: ccb24f4cddb459d164c83c6fbbf0a36f0aea8110726f4dce2ab2eca1fdab4005
font_01_sfnt_off00011e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 11124 bytes
SHA-256: 9cbcb8267c2835e0e379f47d1cc2da23e8e3ebb115442ba77279384220b06f87
font_02_sfnt_off00014413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14413 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c