Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ae21d9a149f901…

MALICIOUS

PDF

82.2 KB Created: 2021-02-22 06:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6fe5379b6096309ec655a137d2f5a80b SHA-1: 9db2fd11e4ea6aa484a9f36bc7f6db3a8b945700 SHA-256: 88ae21d9a149f90186d82e3e3a2aa087269432b035f0ba4f0b0aa381020745ca
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

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
  • 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 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/strik?utm_term=how+to+start+writing+a+synthesis+essay In PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/jakoseboditalaluxugu.pdfIn PDF document text
    • https://domenadonasi.weebly.com/uploads/1/3/0/8/130874365/f33d9924ef62f.pdfIn PDF document text
    • https://sifajovu.weebly.com/uploads/1/3/4/8/134874608/354c5e8b061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5ff0e8caabcbe.pdfIn PDF document text
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/raduwuvimudejud.pdfIn PDF document text
    • http://gsmall.space/the_complete_guide_to_tarotz65n2.pdfIn PDF document text
    • http://dithetsen.xyz/7009541470v2hi4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416802/normal_5fca4c8b8f7f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452845/normal_600102dda9665.pdfIn PDF document text
    • http://hydra.moscow/21185033151dhd5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luniwopekesoto.rf.gd/lafurusogez.pdfIn PDF document text
    • http://bavipilebevim.epizy.com/action_replay_full_movie_free.pdfIn PDF document text
    • http://xumizaxojumiko.epizy.com/book_binding_materials_list.pdfIn PDF document text
    • http://fotopokidag.epizy.com/rocky_2008_full_movie.pdfIn PDF document text
    • http://xedekig.rf.gd/class_dimension_guide.pdfIn PDF document text
    • http://fikexole.rf.gd/queen_size_bed_sheets_near_me.pdfIn PDF document text
    • http://furovival.rf.gd/50650668064.pdfIn PDF document text
    • http://liforese.epizy.com/gofusoxo.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_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 5068 bytes
SHA-256: 090a2546a4c1c8ad8ed4ac5a1c578cc72b85554a7232ea3229136207caf99740
font_01_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 10360 bytes
SHA-256: 675dc6f1b2a3221d0ee9f93dcbe8219e7938d100757d46806a1e0911fb2098fe

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