Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b5714825724b62…

MALICIOUS

PDF

86.1 KB Created: 2021-03-18 16:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9498c174572c09a61768c7bf867d6449 SHA-1: cf133b337c563a3721548dde275c2017bb6f75e9 SHA-256: 61b5714825724b6239fe0ca47a7f8a7dad03ca598d371f35f328645d045e9b57
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies the document's structure as a non-clustered link farm on disposable hosting, reinforcing the malicious nature of the sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://soxebez.ru/123?utm_term=personal+capital+blended+performance PDF link annotation
    • https://tizidebiwefixim.weebly.com/uploads/1/3/0/7/130739379/a4ffb31990655.pdfIn PDF document text
    • http://kodatapipezan.22web.org/2224395872.pdfIn PDF document text
    • https://zipibolusoxa.weebly.com/uploads/1/3/4/6/134627603/zerujabum.pdfIn PDF document text
    • http://jotositafi.22web.org/hitachi_fridge_review_singapore.pdfIn PDF document text
    • https://vuvararuwojagis.weebly.com/uploads/1/3/4/6/134608035/giranotosemuzemiguzi.pdfIn PDF document text
    • http://wolasawozowi.iblogger.org/school_calendar_2020_to_2020_deped.pdfIn PDF document text
    • http://famesodelazij.22web.org/strengths_and_weaknesses_of_teaching_strategies.pdfIn PDF document text
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/9dce5e4cc3.pdfIn PDF document text
    • https://migigazafakag.weebly.com/uploads/1/3/4/3/134377970/97bbe6492034.pdfIn PDF document text
    • http://gabixumupa.22web.org/93325481725.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/rarit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fadafupeludelin.rf.gd/romantic_short_stories_in_english_free_download.pdfIn PDF document text
    • http://nabavewixetutax.epizy.com/scantronic_9448_programming_guide.pdfIn PDF document text
    • http://topufopotu.epizy.com/allama_iqbal_poetry_about_imam_hussain.pdfIn PDF document text
    • http://sewepara.epizy.com/anomalous_secondary_growth_in_boerhaavia.pdfIn PDF document text
    • http://xipijokezi.rf.gd/dujug.pdfIn PDF document text
    • http://patemud.epizy.com/65577836320.pdfIn PDF document text
    • http://ronevudewakoreb.epizy.com/40638803121.pdfIn PDF document text
    • http://rirazito.epizy.com/autumn_tale_piano_sheet_music.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_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 5444 bytes
SHA-256: b60f0986b9704a4362a386a6a776d6d7fe0b3101d40dc8ca3854ade9fab3d588
font_01_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 11396 bytes
SHA-256: fa4e0ebf47bd211cddeffc99ff8b110ee4d48168cbfd9924aa04c8ba4c5ab471

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