Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aad6e9f5451d063…

MALICIOUS

PDF

90.0 KB Created: 2021-04-19 21:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c719540237b382e80310a49fa7869d02 SHA-1: d8e3f85b7c0cb182d2d8a07f3dfd529510818b3a SHA-256: 9aad6e9f5451d063f6fbde56c2c0fcbd2b4f291edcf349b17182b072a514ec4f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful content.

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://jacksth.ru/strik?utm_term=imax+b6+lipo+balance+charger PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450513/normal_605c9b07d233f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480580/normal_5fed65d653294.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/5319369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476420/normal_605988b0c8bd8.pdfIn PDF document text
    • http://xonesasa.iblogger.org/tejojideworisasowof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_60512ee6d3f5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_5fdc1b32282c7.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/titulef.pdfIn PDF document text
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/solex_kusiribixaro_fipaguxidovu_debeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://famuruvif.epizy.com/22867066177.pdfIn PDF document text
    • http://kitalanexu.epizy.com/94954373946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a62dc5-9d85-4a20-9103-b356a617f021/planificacion_estrategica_personal_ejemplo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6a6ac9-a4f5-49fe-b2f3-d508f43ee0e2/what_is_the_spiritual_meaning_of_a_pink_rose.pdfIn PDF document text
    • http://wevumixedin.rf.gd/xavarewaguwi.pdfIn PDF document text
    • http://xixonuw.rf.gd/how_to_use_bissell_proheat_turbo_2x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/952acbc7-3c58-4ef8-93d0-206d02302fe4/omr_ocr_micr_are_all_types_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c212938-69ad-466c-9812-6383fef86ef2/bixivozuzikokajap.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_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 5468 bytes
SHA-256: e32cd0458be4c63c2fbb128703abd68c91e57149e490e48dd810c5a5c4fc194a
font_01_sfnt_off000133b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B1 11532 bytes
SHA-256: 11234b0ab48df558eb45e8885034b3a5b07200ee7f82fab7ca09d094ed6c41c9

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