Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1036b42fdcb122…

MALICIOUS

PDF

67.7 KB Created: 2021-03-15 13:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3a1e757f576a43591b68ded506a24795 SHA-1: 4074be5f5c9a50057ab6e7ce5b24335b77939404 SHA-256: cc1036b42fdcb122be80cc555ba8df7b12b9739bb71366011f4eb30648921a1b
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=chapter+1+introduction+to+earth+science+study+guide+answers PDF link annotation
    • https://cdn.sqhk.co/lodikorep/hiFjixf/bingo_at_home_for_laptop.pdfIn PDF document text
    • http://trycabinets.xyz/vabapabaxoo0pof.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/actualtests_cissp.pdfIn PDF document text
    • http://alphabitx.com/how_to_change_my_calculator_to_radians97gy7.pdfIn PDF document text
    • http://oblakova.ru/kung_fury_movie_2ccuar.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/xxiigrj/removing_fake_nails_at_home.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/how_much_does_an_average_baby_grand_piano_cost.pdfIn PDF document text
    • http://energierecrute-emplois.com/637542928743qndz.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/awareness_campaign_proposallgde2.pdfIn PDF document text
    • https://cdn.sqhk.co/rosavuzezig/JifXW8o/42620878205.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/jomademijekoxupunoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/world_war_z_book_vs_movie_differences.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/61304142150.pdfIn PDF document text
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_89fcb57a0e234fb994e33fa2c56e1789.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_2061998b9581484992fa1ecd9bfc0baa.pdf?index=trueIn 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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 5456 bytes
SHA-256: 3b4be88d06e90bb9e0957ee8f3c46363c2dfca6aa6cf328693ae498fecdaed31
font_01_sfnt_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 10136 bytes
SHA-256: 39a113772979b8ea05bfa7188d2fc8102301ccfc02df1ed84db4c2de34d47ac5

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