Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9203a2e201165e7…

MALICIOUS

PDF

75.3 KB Created: 2021-04-19 10:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fecbfddf0843b041ac3795766625ecb8 SHA-1: 4eb87d200477a089945a051697895bcc1ac171cc SHA-256: c9203a2e201165e7d38e44b47c0d2d2fd74ea752a95e176e2c9c4907a107c5f8
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains numerous external URIs, many of which are on disposable hosting and appear to be part of a link farm designed to redirect users. The primary malicious URL identified is https://druttle.ru/strik. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=how+to+bridge+verizon+fios+quantum+router PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409409/normal_5ff1839fb1bd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5fc9619533702.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/xubizoxibor-mafajasijekeri-polumasurod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416938/normal_604825a11b1eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_605300904e4e6.pdfIn PDF document text
    • https://tubuporupuruder.weebly.com/uploads/1/3/4/8/134879971/9087686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_60307f26efc6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6139928f-023e-4712-a375-a489fa30bc11/how_to_earn_dividends_on_acorns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1df6375-6a0a-455a-b504-f6e3e6438e6d/dipiverusanojawudamoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa348c74-816a-4cf9-bdd4-7cf0d6267f8b/como_hacer_una_linea_del_tiempo_de_mi_vida_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/xidewonetejiruta.pdfIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_f20fc1b3a530497e8b22dee70fdab252.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_971a603c4d97427293f24423396cb5f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavale/quad_chamfer_3ds_max_2018_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/pegoluju.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_be36ea1e537044aa8a8799fd0ab9dc46.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_0a580a2cba2d44d2b184c603d51e839e.pdf?index=trueIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_d79a23d5b15245b99fd0c4eec9e30459.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavalukato/1516559281.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/kivez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36fd5ca0-fb1e-49c2-9554-4aefb547b1ab/58086499405.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_29e349a7195448d0950b50330a17e947.pdf?index=trueIn 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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 5624 bytes
SHA-256: 58627d98f6b1f61da339183d2c21f18477311e85f44d58d3e302a2d3006bf0b6
font_01_sfnt_off0000fa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 10944 bytes
SHA-256: b4367c5982fec6f5dc3b3de62af52360072078cddf8cc41aed86843905f2e967