Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4d0de30d048fd9…

MALICIOUS

PDF

76.7 KB Created: 2021-06-05 22:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5e32e5824b3c3e5daea3457521a99b28 SHA-1: 55562a34d0fa781d90cda369683752fad627fec0 SHA-256: 2b4d0de30d048fd9050e9792f3ce5a566d28906aebfe42c728c4acced8a55bcf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing lure. The document body, though heavily obfuscated, suggests a topic related to health, which is a common theme for phishing attempts.

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://garglob.ru/pbw?utm_term=how+to+treat+a+popped+acne+cyst PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444874/normal_5ffe74cccdae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_60627e04168f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_5fd83dd4e6441.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485010/normal_5fde63569976a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_5fea2dc856779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_604ff1f466fa1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joraxakegeg.pbworks.com/w/file/fetch/144549438/briggs_and_stratton_450_series_oil_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48df186e-4aab-4172-a5a7-a9bc24ab9bd6/plantilla_libro_mayor_para_imprimir.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/77123984636.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/f/lusir.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144524286/59358782126.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/votopoxuma.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144519783/autocad_cannot_attach_xref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ad6737-32dc-498d-8041-527b6c466033/save_the_cat_book_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/175bf4f2-30e9-4814-a6bd-595e97cf2877/thomas_mann_magic_mountain_review.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/w/file/fetch/144600885/37023145985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6713074-854d-4302-bf1a-e0862ebcd2f3/31172955393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ee7c2c-c776-4ccf-b277-53ea9cc5315b/undertale_piano_sheet_music_with_letters_megalovania.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_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 5192 bytes
SHA-256: b42fc5d50de7ddbad1a59c1e2a5d73af36ee6aa0bd7cbbc9b07c272900755509
font_01_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 10912 bytes
SHA-256: b6bdf12f60522800d346d5438669fd0ea643009c895183f16ebf31341d22e4ec

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