Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33d600d1f638714…

MALICIOUS

PDF

78.9 KB Created: 2021-02-15 13:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 95b41392b64fafdee31fbf6f4d8a34e2 SHA-1: cb7f079569e671f4712486e2180070ed303c40e8 SHA-256: e33d600d1f638714025c57b7f03d5c04a87bc6a7bd70f878c829a4f50750cd99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one specifically identified as a redirector for a link farm, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, further supporting a malicious intent. No scripts were extracted, but the presence of external URIs and the overall structure point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=ejercicios+ingles+basico+para+ni%25C3%25B1os+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fe54501a8cf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_6012a59c0d548.pdfIn PDF document text
    • https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/0a126e3.pdfIn PDF document text
    • http://2gusevshop.space/687168326615c5hr.pdfIn PDF document text
    • http://wagagawoduzom.iblogger.org/barbie_cartoon_images_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5ff6926baddcb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kitakilesa/broil_king_signet_20_manual.pdfIn PDF document text
    • http://wipovevoliku.epizy.com/assembly_language_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/80047585355.pdfIn PDF document text
    • http://sotexazonilot.rf.gd/17895153685.pdfIn PDF document text
    • http://tonunipuwe.rf.gd/67208582777.pdfIn PDF document text
    • http://fekerudosepu.rf.gd/degajesovadak.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 5416 bytes
SHA-256: 24e8e347d6cd5a1b5cda60681fe39d8f01384bd9a2d93e4e497e47c3dfa57d75
font_01_sfnt_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 11812 bytes
SHA-256: f934faaa3c70050e22b0ecf7fc998f8a5f7710f4d121f629f96d5c0e5d1cdc7d
font_02_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
font_03_sfnt_off00011e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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