Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1b41027cdff3a0…

MALICIOUS

PDF

74.6 KB Created: 2021-03-17 23:13:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3aca857dafb150470c0baea3379acfdf SHA-1: 73819a4c2182bf2358f40c4819c08dae92bdff65 SHA-256: 4b1b41027cdff3a0910dadcead3308bed6e156212e2c53b58b9953c2e733e9ac
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to suspicious domains and are likely part of a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=amino+acids+and+their+structures+pdf
    • http://oneplusonemain.xyz/postknight_guide_magnolia80gvs.pdf
    • https://pujonavow.weebly.com/uploads/1/3/5/9/135958036/fiveneno_sumofikalojodi.pdf
    • http://juwaniwabi.medianewsonline.com/fixubojo.pdf
    • http://antileqphh.site/analects_of_confucius_book_7_summary3iree.pdf
    • http://quickpapp.online/lizuduxutuputa9i9ik.pdf
    • https://tewizoduwab.weebly.com/uploads/1/3/5/3/135341898/02673d72a9584f.pdf
    • http://mufosubofamar.mywebcommunity.org/87597701174.pdf
    • https://geduwitanezuter.weebly.com/uploads/1/3/0/7/130738684/5242262.pdf
    • http://glawerry.online/naxuxakadazamor6xpt8.pdf
    • http://dizititakozazi.mywebcommunity.org/blues_for_mister_charlie_character_analysis.pdf
    • http://winoorama.site/82928688429vfmjn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/48a1d260-aed2-4ba8-8bc8-8351a2472e44/when_we_feel_young_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/c0354e1d-2502-407f-b131-8d913add7912/28614538020.pdf
    • https://uploads.strikinglycdn.com/files/b486368e-b0ae-4519-9558-089c7dbd5e42/advanced_calculus_of_several_variables_edwards_solutions.pdf
    • https://uploads.strikinglycdn.com/files/25454413-77e7-46c1-b499-27a0f79fa787/pasodilise.pdf
    • http://gurabagoderes.atwebpages.com/clinical_trials_free_download.pdf
    • https://s3.amazonaws.com/senodiw/indian_navy_recruitment_2020.pdf
    • https://uploads.strikinglycdn.com/files/681532f0-e9ce-47f3-b38b-66637b0eb002/lord_i_need_you_chords_chris_tomlin.pdf
    • https://uploads.strikinglycdn.com/files/6a01d001-1946-4f9b-a548-0d211663036d/79609171911.pdf
    • https://uploads.strikinglycdn.com/files/0872f4de-ef31-4593-9179-884fd5ac7b75/what_to_write_in_a_personal_statement_examples.pdf
    • https://s3.amazonaws.com/nalifij/wugonijoki.pdf
    • https://uploads.strikinglycdn.com/files/4bba5842-7851-4208-b156-add452d20d7d/bafagobodupozusumuri.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e909.bin
37f4a7dc7e8d7ebd6f74ba4629dd223630a123f15569c94f35f6ce3de15bf93e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 5352 bytes
font_01_sfnt_off0000fb11.bin
e3846b18428e26d7c8e3659f745d760b5c43e7ac4da449b73fe6dacdd61a3cf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 10212 bytes

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