Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6778433c310e88…

MALICIOUS

PDF

78.3 KB Created: 2021-04-21 08:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7395e798a94d15d791484b93f2a6a3ea SHA-1: cb0466c239a81e706283aac6c57526b5b57249ad SHA-256: 0f6778433c310e88079e102df4d58c7f60751393d876fa666653bf16c85e5b55
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=is+bbg+worth+it+reddit PDF link annotation
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/bavetapokonifu.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/bactria_margiana_archaeological_complex.pdfIn PDF document text
    • https://mepiwazozetegot.weebly.com/uploads/1/3/4/4/134465301/repifeximozisekinuj.pdfIn PDF document text
    • http://tokudujadi.medianewsonline.com/mowavubibomonaxogoz.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/zafupazuwijoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/hegg4na/rolling_sky_music_illusion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_5fd28237153fa.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/7653185.pdfIn PDF document text
    • https://cdn.sqhk.co/litopozuf/fxYQMgg/h_band_smart_watch_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/oAdjhhf/fun_4th_grade_math_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fe490c8446d9.pdfIn PDF document text
    • https://gagofabujinu.weebly.com/uploads/1/3/0/7/130739012/7609028.pdfIn PDF document text
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/nitititimaser.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/hMbOhhJ/simple_modern_water_bottle_32_oz.pdfIn PDF document text
    • https://wibanakipose.weebly.com/uploads/1/3/4/3/134361509/zozinulanawe.pdfIn PDF document text
    • https://birivisixakaxe.weebly.com/uploads/1/3/4/6/134608058/lavawewijerak-jivumifejez-zejoleja.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/how_will_this_scholarship_help_you_achieve_your_goals_essay_examples.pdfIn PDF document text
    • https://ligepakege.weebly.com/uploads/1/3/1/8/131871609/1676ebd99a01a.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://uploads.strikinglycdn.com/files/cb21bc15-f998-4dc1-ab89-aab6e1ee58b0/minister_license_laws_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f443a2f-cab6-415a-b083-c75bc6d7be4c/ejercicios_de_limites_laterales_con_grafica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3907a3-818d-44df-b5b7-fde5da605546/92871220443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2139d660-e385-4da1-ac58-3ed700323761/can_you_opt_out_of_receiving_child_support.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85576f65-c7b1-49cd-8ec5-63df50b2b21f/14608875002.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_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 4696 bytes
SHA-256: 93836ac4caa75616577c1d63835107c38300a4ea3375cc79ca5ddd7096b0cd40
font_01_sfnt_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 11072 bytes
SHA-256: 13b7be20776bf8f6e173105879168a80f9d1510621fc7b38936b34cabf98a86a
font_02_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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