Malicious PDF — malware analysis report

Static analysis result for SHA-256 53df08b671b96670…

MALICIOUS

PDF

87.6 KB Created: 2021-02-15 05:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1d4e2e578d069e1e1ca39b4b6f834e33 SHA-1: 7dee0de3eb38606496e5b72edcffda4dcbc84869 SHA-256: 53df08b671b966706fecaf3ed7958f4421ea744ba59a744d1fafbe9cda82064d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to link farms and redirectors, indicating a malicious intent to direct users to potentially harmful sites. The heuristic firings confirm the presence of malicious redirector links and a link farm, suggesting this PDF is part of a larger campaign to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=simple+piano+sheet+music+for+bohemian+rhapsody In PDF document text
    • http://otomail.business/udp_glotorrents._pw_6969_announlybj8.pdfIn PDF document text
    • http://sberbank.services/cold_war_2018_soundtrackclh5x.pdfIn PDF document text
    • http://hookup673.site/dovewenutibilizoww7dtt.pdfIn PDF document text
    • https://dojinutek.weebly.com/uploads/1/3/4/1/134108596/fe70df.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/241e430a542.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/4962022f04744.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/e_r_c_p_ka_full_formkva4p.pdfIn PDF document text
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/rexunugolalitonogu.pdfIn PDF document text
    • http://shopee24.site/awakening_the_zodiac_movieep2nm.pdfIn PDF document text
    • http://nebo-baikala.ru/aiesec_delhi_full_formby7g9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_5fd9bb2613986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://talidarufuji.epizy.com/w_4_exemptions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/bahubali_film_movie_video.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/water_cycle_information.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/xuwosadu.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/all_video_er_online_mp4.pdfIn PDF document text
    • http://xofiketur.rf.gd/bharat_film_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/harga_cetakan_batako_press_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 5740 bytes
SHA-256: 0a3b5e85eaa190fbf3a33c23274a0180f9648871630e50d45d693211e9a697f3
font_01_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 11108 bytes
SHA-256: 7024820f7138d8d5156cacaf25d7050675682c2d7eebfc7942c3002a906bf13e
font_02_sfnt_off00013b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B66 16100 bytes
SHA-256: b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742

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