Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5d85857f7c2b31…

MALICIOUS

PDF

79.9 KB Created: 2021-05-16 09:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 91ee65ad5d134d26071bac70afd6f0c5 SHA-1: 2630b9717cce48ca91ed37ff345ca0768beb589e SHA-256: ab5d85857f7c2b3163895693cea1f605f1439ff598e4de944ac7c2cb176d88c1
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 domains, and is flagged by heuristics as a link farm designed for SEO manipulation. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=stephen+king+books+ranked+2020 PDF link annotation
    • http://itawegan.space/how_to_change_background_on_kindle_firezspcz.pdfIn PDF document text
    • http://easylearning.space/2004_honda_rancher_350_tie_rodd8r6p.pdfIn PDF document text
    • http://vajokopopozikem.medianewsonline.com/24961266304.pdfIn PDF document text
    • http://presentinsta.online/266003929048cs89.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/bts_skytrain_bangkok_map.pdfIn PDF document text
    • http://remastacer.com/neila_rey_workout_wonder_womanfyyus.pdfIn PDF document text
    • http://chunyoo.com/ic_7805_voltage_regulatorwaoyd.pdfIn PDF document text
    • http://cupe1.ru/ninja_samurai_assassin_hero_2_game_downloadu4nph.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dfde94ff-8c6c-411d-9c04-f18b57906ec7.filesusr.com/ugd/47ec90_73c22ee9a6984222a6859768d5439596.pdf?index=trueIn PDF document text
    • https://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_c1143df0974e4f03ae73c7e9b68e737b.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_e0d34ca4f4ee46e8a4fa441d349335a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9cfd03a-6c5f-40a7-8a55-ab70afe06ca8/bear_cruzer_bow_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/58655435963.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/what_is_the_setting_of_dark_they_were_and_golden_eyed.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/spelling_words_for_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7c6db0-fad2-49b1-b7be-2051f1f6c4a6/supovibedimajadumox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5705de26-156d-49f5-b3e7-d5c24dabcc41/jlab_earbuds_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa06c7e8-f553-468f-b075-df87a30c8e93/82063814809.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/54026809125.pdfIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_077ec54f47a74e32b69d5f6aaf2285e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/fisica_atomica_exercicios_resolvidos.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 5768 bytes
SHA-256: 0be98324b0d0683bde25d3e37c83ddc2a244217fd63169c373ca05b6194e541f
font_01_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 11076 bytes
SHA-256: e8ce7ec9a83537bee305276ca2325374eca6861da878c4c116f8f3d7b6ff551d

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