Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e0691b983e3a1b…

MALICIOUS

PDF

77.4 KB Created: 2021-04-12 10:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b5b4da2420163345c326af5ef39eef74 SHA-1: 9e153bce24504d9eb02a832f8b21bc74b6b2f6ff SHA-256: 61e0691b983e3a1bf4eab5c6bbd0cfe09deaa3b4b813208bd4661f2e7083486a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=how+did+alliances+contribute+to+world+war+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390055/normal_602188f3602ef.pdfIn PDF document text
    • http://nubolutlion.xyz/what_goes_under_discontinued_operationsftbic.pdfIn PDF document text
    • http://milano-moda.space/tandy_1650_computerized_chessc0g7u.pdfIn PDF document text
    • http://xebupado.mypressonline.com/spelling_bee_word_list_for_adults.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_5fe6de360eda7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_5fd0dac61439b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411683/normal_60504864bacb9.pdfIn PDF document text
    • http://dressnbuy.com/codycross_answers_group_25_puzzle_24uq3i.pdfIn PDF document text
    • http://ideaita.fun/balao_informatica_valinhoslq29l.pdfIn PDF document text
    • http://ginupedarokuxu.getenjoyment.net/tibuzupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422150/normal_606554333edc0.pdfIn PDF document text
    • http://servisvds.ru/roomba_scheduler_partsdi0vs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_6042d4d836cb7.pdfIn PDF document text
    • http://ru-payment.casa/long_thin_uncoiled_strands_of_dna1h0fx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_604d673f19243.pdfIn PDF document text
    • http://women-ita.space/nakojimufuneneo1p9l.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/24126615005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_602a393363f50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_601b70ac843fe.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/el_feudalismo.pdfIn PDF document text
    • http://momentshop.website/chinna_mani_kuyile_song_masstamilanh1t75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fd6768a0285c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/algorithm_design_manual_course.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/vusurag.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/gaxewu.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/korupesanepixasas.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/4294645114.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_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 5176 bytes
SHA-256: 507fa0359a7233db67c867e557d438c40b7ee109ffc6200d864c0798bf99ffc5
font_01_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 10472 bytes
SHA-256: 6c1ecfc9f8ba022edf919cd3726ef8b3ef01d5b236c0b945f1f1fffa783f63de

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