Malicious PDF — malware analysis report

Static analysis result for SHA-256 4726b64bb8bd1004…

MALICIOUS

PDF

80.7 KB Created: 2021-02-24 15:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a2dbf7c2d047a8c9069337aec28eacd2 SHA-1: c730c927a6629db7ada3140549b76cf3f47b019d SHA-256: 4726b64bb8bd1004e4aa6224c6366f9c8da71510136cd3ecab0c5f3d0760f065
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to disposable domains and hosting PDF files, characteristic of a link farm. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=time+warner+cable+racine+tv+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366632/normal_5fc664b27cc7d.pdfIn PDF document text
    • http://rabiveronoxo.22web.org/folufutewijakebesen.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/bedopagisazowijeza.pdfIn PDF document text
    • http://nabenopavaz.iblogger.org/6871677546.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/zufafojef_fetelotoper_mubejaka_xuxaxunewanuv.pdfIn PDF document text
    • https://sobomevoza.weebly.com/uploads/1/3/0/7/130739746/d9b86.pdfIn PDF document text
    • http://nobumowur.iblogger.org/92403712236.pdfIn PDF document text
    • https://zoletewiv.weebly.com/uploads/1/3/2/6/132695336/2178579.pdfIn PDF document text
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/gazotupimemutob.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/makalur_rekimovuxutake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_601c6a1b411d5.pdfIn PDF document text
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/fijuvuwa.pdfIn PDF document text
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/f754ba57bfbed9.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/9422352.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekovomojuto.epizy.com/vokupubotivezaduvo.pdfIn PDF document text
    • http://zuwarikufaz.epizy.com/iata_airline_industry_report.pdfIn PDF document text
    • http://jilagikudi.rf.gd/jivifekuvurokelixatevaka.pdfIn PDF document text
    • http://ziwivalotezeti.rf.gd/88030076713.pdfIn PDF document text
    • http://rorizupoduvu.epizy.com/staff_appraisal_sample_report.pdfIn PDF document text
    • http://runonadopufeta.epizy.com/8658595856.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_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 5324 bytes
SHA-256: 4413228ec8829659c8bf329f68ba772215746cb287496e67fe3c5885f1b9d901
font_01_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 10556 bytes
SHA-256: 77db496ce1220717606486c0952744384446c9fd78e8fb0dc41561da9cdbfd83

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