Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e523bcf4e15c43f…

MALICIOUS

PDF

73.3 KB Created: 2021-02-09 22:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e380d0aee4439bf9f85d46ae09721d6a SHA-1: 530befd7f6a328d5190f275624f8d3792196d665 SHA-256: 8e523bcf4e15c43f05c72ab1b22039354b49e4873b5310e84d3de4e84f2f4a4f
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to suspicious and disposable domains, with high-severity heuristics indicating these are part of a link farm and employ invisible links for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://maypoin.ru/aws?utm_term=medical+alert+systems+consumer+reports PDF link annotation
    • http://aycotoro6.xyz/ludo_controller_pro_apk6y4ch.pdfIn PDF document text
    • https://neriguzoxivefu.weebly.com/uploads/1/3/5/3/135319498/9061011.pdfIn PDF document text
    • http://antileqphh.site/mohawk_commercial_carpet_warrantyrov8c.pdfIn PDF document text
    • http://circleshtang.xyz/toyota_verso_service_manualzuvxv.pdfIn PDF document text
    • http://biolinkus.me/36722832179nv68p.pdfIn PDF document text
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/wobozimawodixeg.pdfIn PDF document text
    • https://karegito.weebly.com/uploads/1/3/4/6/134626514/diwap.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/gekumubutabugusu.pdfIn PDF document text
    • http://devlp.design/biblia_hebrea_peshitta_en_espaolmilvd.pdfIn PDF document text
    • http://gramnews.xyz/94656190677r3z78.pdfIn PDF document text
    • https://gofubemasuxa.weebly.com/uploads/1/3/2/7/132712405/navuzurikabeda_fogiri_safixumoxafep_wujedabuvawekaw.pdfIn PDF document text
    • http://mgacessoria.online/first_aid_kit_band_illnessb7a2m.pdfIn PDF document text
    • https://pakakisokuz.weebly.com/uploads/1/3/1/3/131381756/3796763.pdfIn PDF document text
    • http://lnstagram-support.live/dc_dutta_obstetrics_9th_edition_google_drivedc5d5.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/bc64199bb4896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rovikejovejoto.rf.gd/2989095454.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/77580785459.pdfIn PDF document text
    • http://wuxojawe.epizy.com/vuvipokuroburufufe.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_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 5324 bytes
SHA-256: 75f49d626db5d85b56c79c7c950afa855ae073bd663c47b038ef65f452c6c06c
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 10684 bytes
SHA-256: 2a873028c5ffde97251bee490ab2dd3d4ef22d0c436fcca60b6c7ad5188f3157

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