Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d5eae803ea6451…

MALICIOUS

PDF

74.2 KB Created: 2021-05-18 01:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aa740b2681d2d6bfd9aecd2b89d4e571 SHA-1: 5996fbbf598c2d44aedb0d80565bc50689cb5073 SHA-256: b9d5eae803ea6451cb07838347217fb1156dafc897b1cd7f40e4cec343aeb501
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though obfuscated, appears to be a lure related to a movie cast, likely intended to trick users into visiting malicious URLs for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://xezojetit.ru/strik?utm_term=el+diario+de+greg+pelicula+reparto PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375894/normal_6067bf94597ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_602c701f51535.pdfIn PDF document text
    • https://linusakeziri.weebly.com/uploads/1/3/4/7/134747074/gexix.pdfIn PDF document text
    • http://zinujelazozud.22web.org/butterflies_kacey_musgraves_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fca648c11268.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/1e7573ccdaa0.pdfIn PDF document text
    • http://loxapul.iblogger.org/94362209793.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389830/normal_5fcd6ebc5500a.pdfIn PDF document text
    • http://sumekef.22web.org/65933301892.pdfIn PDF document text
    • https://tilifopufobi.weebly.com/uploads/1/3/6/0/136049844/3258411.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4bc78ad-140c-4131-b456-f3a9b379adbb/zadigi.pdfIn PDF document text
    • http://mixonanax.epizy.com/37789588844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16ae430-e88e-4890-a7b7-69bfe62d85b2/62932596902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9df0fb2-176d-4419-95df-622468d64285/28233913987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b72ea4-a66f-4955-9c5a-06b402eeb58c/12755902089.pdfIn PDF document text
    • http://mamotupot.rf.gd/ardea_real_outcome_fund_performance.pdfIn PDF document text
    • http://datonojafasaxup.rf.gd/saturation_of_current_transformer_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c34d31-139d-45b9-9e42-69f551e2d43b/composite_functions_word_problems.pdfIn PDF document text
    • http://zawopomosegasax.rf.gd/halloween_sheet_cake_decorating_ideas.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_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 5020 bytes
SHA-256: d721aa7286f856707be0436d430e07bae6db2110699409c4f9caaa46006e2ef1
font_01_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 11896 bytes
SHA-256: f1ebe44bff42605013ad36afc0d58a2202662ad72e621ed810bb7eeb7452f6c1

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