Malicious PDF — malware analysis report

Static analysis result for SHA-256 f385044624e48c05…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 10:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5ce90becb30320bfd472bbca7dc868f SHA-1: 099a8811cd25ea779699b8f42195f27501a5e149 SHA-256: f385044624e48c05df1c53e68ab7dcbed36504e5063231e05953a133658c7b18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains. The primary purpose appears to be SEO poisoning or distributing further malicious content through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://bamor.org/userfiles/file/8116380361.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f341292601---soxuxugebe.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/semonubate.pdfIn PDF document text
    • https://baptistfriends.org/media/porukutupodim.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/bijorarokawiv.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/50315960455.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/vamelisefede.pdfIn PDF document text
    • http://ahknchem.com/upload/files/butamefaragumuma.pdfIn PDF document text
    • https://sergiomauri.com/images/file/jukevija.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/pafabupolixitenekebonoja.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/xazabaxobiferodinobot.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/zekiki.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/1442498152.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/11351202440.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/12818275988.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/47138234125.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/vezaxasekosumusinif.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/26034655992.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ev1fku1od36lrf1b0pmoqqfokc/binofimuwurititaran.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/67085701480.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/kivatagutumagenebowawum.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/44323384359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=moqo+view+app+androidPDF link annotation
    • 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://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_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 10364 bytes
SHA-256: e7317283e207ab9fb5f5163825ddc05d41cbbe44d2150f66740f5f98dd193cee
font_01_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_02_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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