Malicious PDF — malware analysis report

Static analysis result for SHA-256 636cfbe9255584d2…

MALICIOUS

PDF

91.1 KB Created: 2021-04-20 14:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 950f744fe3c79187b7b296439fdd86d8 SHA-1: e5a4bd38401b4f985651ff0b3dcf731d50b44ae8 SHA-256: 636cfbe9255584d2d76e999f5faedceeab1a7c45f5d497e683991f68ca0a5800
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of the file. While no scripts were explicitly extracted, the presence of numerous external URIs indicates a likely intent to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=monster+in+law+wedding+dress+designer PDF link annotation
    • http://kukunilud.iblogger.org/analgesia_definicion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_60696d6b1120e.pdfIn PDF document text
    • http://tatanip.medianewsonline.com/valuation_of_interest_rate_derivatives.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/vertebrate_palaeontology_benton.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_6014bfb17e39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_602e4450a396b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_60667e5065e2c.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/wuzalugiseto/37902469189.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_ae6a524dac734678b2804ecc1bf1b865.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/ergonomics_in_the_office.pdfIn PDF document text
    • http://vipifusofired.epizy.com/kenmore_70_series_washer_wont_spin_or_drain.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/xodupufudefufaxebokix.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/bharatanatyam_hand_mudras.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/affidavit_format_in_marathi_font.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_933eb4b97d7e4465ae0dfdd01174ff68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nagev/short_professional_bio_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/95166145647.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/53840273096.pdfIn PDF document text
    • http://goxozabakokivo.rf.gd/zepufusomubojev.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/44512603202.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/defube.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/28917992912.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 4876 bytes
SHA-256: 34a4cd89f4f653f58d6ac55836028db85d74616a6d41a23beacf7066744f2dd0
font_01_sfnt_off00012a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 11500 bytes
SHA-256: e8a4891d04cf1110e44603069d7096bb4033ee5082a1a2c4e652c7e4591eb8b6
font_02_sfnt_off00015092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15092 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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