Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13cfb666aa73fbf…

MALICIOUS

PDF

76.5 KB Created: 2021-04-24 02:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0283c256b8e5f555ee28ab89a2462fe3 SHA-1: 5b9e7433b37bfd4a415f14083e3e27734ce2a52b SHA-256: a13cfb666aa73fbff7cdb667233aa501159a2427c57636a71d8008f4d0a61f16
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external URIs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The presence of embedded URLs and the overall structure suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=nursing+care+plans+book+pdf PDF link annotation
    • https://cdn.sqhk.co/zaliroded/ahZwv9A/poviwo.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/bonjour_tristesse_gratuit.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/hdiejeS/58537189898.pdfIn PDF document text
    • http://lejidakoxinetog.mywebcommunity.org/google_academico_tesis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489607/normal_5fe466e2eb944.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/energias_renovables_peru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6012356a67b78.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/kupegovakanunepe.pdfIn PDF document text
    • http://saxosoxajivovud.medianewsonline.com/18505105888.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/how_to_reset_linksys_range_extender_to_factory_settings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480408/normal_606773265fff3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fcacf021dc66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekamodadon.onlinewebshop.net/liwugoxosejuwewexesatuxo.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_6c887c31759c45e8bb9316237fd4ca2b.pdf?index=trueIn PDF document text
    • http://jukasuxoseki.atwebpages.com/89409196983.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/dafizasipiz.pdfIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/lidosoruxijupapuvavabo.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_0d4a44379d244c17bb13f4625cca1626.pdf?index=trueIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/peluxofekose.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_20eefa3b770049af9d2b305ca9426f44.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_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 5496 bytes
SHA-256: 9fb9cb55c126d724216fb3d533a7f62f7f972b242088d277111a7fd080443a99
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 11384 bytes
SHA-256: 186c4b5f571f83732dbc5e00bb7cac52cf46068a0f8785d94342d95a4d795791

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